Common Weakness Enumeration
CWE-79
AllowedImproper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Abstraction: Base · Status: Stable
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
71571 vulnerabilities reference this CWE, most recent first.
CVE-2026-88852 (GCVE-0-2026-88852)
Vulnerability from cvelistv5 – Published: 2026-09-14 06:19 – Updated: 2026-09-14 11:30
VLAI
EPSS
VEX
Title
Joomla Extension - regularlabs.com - Privileged stored XSS via url option in Snippets Free extension for Joomla < 7.0.0, Snippets Pro extension for Joomla < 11.0.0
Summary
Joomla Extension - regularlabs.com - Privileged stored XSS via url option in Snippets Free extension for Joomla < 7.0.0, Snippets Pro extension for Joomla < 11.0.0 - Snippets substitutes variable values supplied by an article tag into saved Snippet content. The affected versions do not consider the article author's trust level. A lower-privileged author can therefore place an unsafe value into a security-sensitive position chosen by the trusted Snippet author.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 11:06 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.regularlabs.com/ | product |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| regularlabs.com | Snippets (Free) extension for Joomla |
Affected:
1.0.0-6.9.4
|
|
| regularlabs.com | Snippets (Pro) extension for Joomla |
Affected:
1.0.0-10.0.6
|
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CVE-2026-88804 (GCVE-0-2026-88804)
Vulnerability from cvelistv5 – Published: 2026-09-28 15:58 – Updated: 2026-09-28 18:02
VLAI
EPSS
VEX
Title
Unauthenticated update of public UI settings leading to stored cross-site scripting in Rancher
Summary
An unauthenticated update of public UI settings could be used by remote attackers to execute a stored cross-site scripting attack in the Rancher UI, in SUSE Rancher 2.15 before 2.15.2, 2.14 before 2.14.6, 2.13 before 2.13.10, 2.12 before 2.12.14 and 2.11 before 2.11.18.
Severity
9.6 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-28 16:31 UTC
CWE
- CWE-79 - Improper neutralization of input during web page generation ('cross-site scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/rancher/rancher/security/advis… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SUSE | Rancher |
Affected:
2.15.0 , < 2.15.2
(semver)
Affected: 2.14.0 , < 2.14.6 (semver) Affected: 2.13.0 , < 2.13.10 (semver) Affected: 2.12.0 , < 2.12.14 (semver) Affected: 2.11.0se , < 2.11.18 (semver) cpe:2.3:a:suse:rancher:*:*:*:*:*:*:*:* cpe:2.3:a:suse:rancher:*:*:*:*:*:*:*:* cpe:2.3:a:suse:rancher:*:*:*:*:*:*:*:* cpe:2.3:a:suse:rancher:*:*:*:*:*:*:*:* cpe:2.3:a:suse:rancher:*:*:*:*:*:*:*:* |
Date Public
2026-09-28 15:53
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CVE-2026-88060 (GCVE-0-2026-88060)
Vulnerability from cvelistv5 – Published: 2026-09-10 19:04 – Updated: 2026-09-10 19:20
VLAI
EPSS
VEX
Title
Angular: SSR XSS via Unescaped <template> Content Across DocumentFragment Boundaries in Fallback Raw-Content Elements
Summary
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 20.3.30, 21.2.22, and 22.1.4, Angular server-side rendering (SSR) in @angular/platform-server serializes untrusted input inside template content nested in fallback raw-content elements such as noscript, iframe, noembed, and noframes. The Domino serializer's fallbackRawContentTags traversal stopped at the DocumentFragment used by template.content, so matching closing tags in xmp, style, script, comments, or text nodes were not escaped. Standard interpolation with comments or text nodes is reachable without relaxed schemas; literal xmp or style requires CUSTOM_ELEMENTS_SCHEMA or NO_ERRORS_SCHEMA, while Renderer2 imperative DOM construction is unconditionally affected. When HTML5 RAWTEXT browser parsing encounters the unescaped closing tag, it exits the fallback container and interprets trailing markup as active DOM elements, enabling arbitrary JavaScript execution. This issue is fixed in versions 20.3.30, 21.2.22, and 22.1.4.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 19:19 UTC
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://github.com/angular/angular/security/advis… | x_refsource_CONFIRM |
| https://github.com/angular/angular/commit/73d8bbd… | x_refsource_MISC |
| https://github.com/angular/angular/commit/89b2056… | x_refsource_MISC |
| https://github.com/angular/angular/commit/ba3bc47… | x_refsource_MISC |
| https://github.com/angular/domino/commit/04f987dc… | x_refsource_MISC |
| https://github.com/angular/angular/releases/tag/v… | x_refsource_MISC |
| https://github.com/angular/angular/releases/tag/v… | x_refsource_MISC |
| https://github.com/angular/angular/releases/tag/v22.1.4 | x_refsource_MISC |
Impacted products
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CVE-2026-88058 (GCVE-0-2026-88058)
Vulnerability from cvelistv5 – Published: 2026-09-10 18:56 – Updated: 2026-09-11 15:14
VLAI
EPSS
VEX
Title
Angular: SSR XSS via Unescaped Processing Instruction (<?...?>) Nodes in Fallback Raw-Content Elements
Summary
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 20.3.30, 21.2.22, and 22.1.4, Angular server-side rendering (SSR) in @angular/platform-server serializes ProcessingInstruction DOM nodes inside fallback raw-content elements without escaping matching ancestor closing tags. ProcessingInstruction data escaped greater-than characters but left less-than characters untouched and did not inspect fallback ancestors, so data such as a matching closing tag prematurely terminates noscript, iframe, noembed, or noframes containers. The vulnerable nodes cannot be authored through standard Angular templates; reachability requires application or library code using inject(DOCUMENT).createProcessingInstruction with attacker-controlled data or Renderer2 DOM insertion inside a fallback container. In HTML5 RAWTEXT parsing, the premature close causes subsequent sibling elements to be interpreted as live HTML and enables arbitrary JavaScript execution in a victim's browser. This issue is fixed in versions 20.3.30, 21.2.22, and 22.1.4.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-11 15:14 UTC
CWE
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/angular/angular/security/advis… | x_refsource_CONFIRM |
| https://github.com/angular/angular/issues/70146 | x_refsource_MISC |
| https://github.com/angular/angular/commit/73d8bbd… | x_refsource_MISC |
| https://github.com/angular/angular/commit/89b2056… | x_refsource_MISC |
| https://github.com/angular/angular/commit/ba3bc47… | x_refsource_MISC |
| https://github.com/angular/domino/commit/04f987dc… | x_refsource_MISC |
| https://github.com/angular/angular/releases/tag/v… | x_refsource_MISC |
| https://github.com/angular/angular/releases/tag/v… | x_refsource_MISC |
| https://github.com/angular/angular/releases/tag/v22.1.4 | x_refsource_MISC |
Impacted products
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],
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"vendor": "angular",
"versions": [
{
"status": "affected",
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},
{
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},
{
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},
{
"status": "affected",
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}
]
}
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}
],
"metrics": [
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"baseScore": 8.6,
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"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
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"subIntegrityImpact": "NONE",
"userInteraction": "PASSIVE",
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},
{
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{
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{
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],
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},
{
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"tags": [
"x_refsource_MISC"
],
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},
{
"name": "https://github.com/angular/angular/releases/tag/v20.3.30",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/angular/angular/releases/tag/v20.3.30"
},
{
"name": "https://github.com/angular/angular/releases/tag/v21.2.22",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/angular/angular/releases/tag/v21.2.22"
},
{
"name": "https://github.com/angular/angular/releases/tag/v22.1.4",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/angular/angular/releases/tag/v22.1.4"
}
],
"source": {
"advisory": "GHSA-j3r3-mxqp-r2p4",
"discovery": "UNKNOWN"
},
"title": "Angular: SSR XSS via Unescaped Processing Instruction (\u003c?...?\u003e) Nodes in Fallback Raw-Content Elements"
}
},
"cveMetadata": {
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"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
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CVE-2026-88057 (GCVE-0-2026-88057)
Vulnerability from cvelistv5 – Published: 2026-09-10 18:46 – Updated: 2026-09-11 20:32
VLAI
EPSS
VEX
Title
Angular: Sanitization bypass via directive host bindings on concrete host elements in @angular/core and @angular/compiler
Summary
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 20.3.28, 21.2.20, and 22.1.0, Angular's compiler and runtime in @angular/core and @angular/compiler could omit or select an incorrect sanitizer for security-sensitive directive host bindings because SecurityContext was derived from the declaring directive or component selector rather than the concrete host element. The mismatch is reachable through hostDirectives composition, inherited HostBinding declarations, createComponent with a custom hostElement or dynamic directives, SVG/MathML namespace elements, and tag-neutral selectors such as :not(...). Attacker-controlled href, src, action, xlink:href, or data values can therefore reach DOM attributes without Angular's built-in sanitizer and execute arbitrary JavaScript in the user's browser context. Applications unable to upgrade can use DomSanitizer.sanitize with SecurityContext.URL before assignment or restrict inputs to validated HTTP and HTTPS URL schemes. This issue is fixed in versions 20.3.28, 21.2.20, and 22.1.0.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-11 16:34 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/angular/angular/security/advis… | x_refsource_CONFIRM |
| https://github.com/angular/angular/issues/69550 | x_refsource_MISC |
| https://github.com/angular/angular/pull/69558 | x_refsource_MISC |
| https://github.com/angular/angular/commit/2f96c80… | x_refsource_MISC |
| https://github.com/angular/angular/commit/6afe6fa… | x_refsource_MISC |
| https://github.com/angular/angular/commit/6caa298… | x_refsource_MISC |
| https://github.com/angular/angular/releases/tag/v… | x_refsource_MISC |
| https://github.com/angular/angular/releases/tag/v… | x_refsource_MISC |
| https://github.com/angular/angular/releases/tag/v22.1.0 | x_refsource_MISC |
Impacted products
{
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{
"metrics": [
{
"other": {
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"id": "CVE-2026-88057",
"options": [
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},
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}
],
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"timestamp": "2026-09-11T16:34:33.902581Z",
"version": "2.0.3"
},
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}
}
],
"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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"vendor": "angular",
"versions": [
{
"status": "affected",
"version": "\u003c= 19.2.25"
},
{
"status": "affected",
"version": "\u003e= 20.0.0, \u003c 20.3.28"
},
{
"status": "affected",
"version": "\u003e= 21.0.0, \u003c 21.2.20"
},
{
"status": "affected",
"version": "\u003e= 22.0.0, \u003c 22.1.0"
}
]
}
],
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}
],
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"baseScore": 5.3,
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},
{
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{
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},
{
"name": "https://github.com/angular/angular/commit/6afe6fa781c2f0931f0aedd729b9884a8fe212ee",
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"url": "https://github.com/angular/angular/commit/6afe6fa781c2f0931f0aedd729b9884a8fe212ee"
},
{
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"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/angular/angular/commit/6caa298dee58319b2d674dc91364e26ffe3ecb2b"
},
{
"name": "https://github.com/angular/angular/releases/tag/v20.3.28",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/angular/angular/releases/tag/v20.3.28"
},
{
"name": "https://github.com/angular/angular/releases/tag/v21.2.20",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/angular/angular/releases/tag/v21.2.20"
},
{
"name": "https://github.com/angular/angular/releases/tag/v22.1.0",
"tags": [
"x_refsource_MISC"
],
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}
],
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},
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}
},
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CVE-2026-88055 (GCVE-0-2026-88055)
Vulnerability from cvelistv5 – Published: 2026-09-10 17:53 – Updated: 2026-09-10 18:15
VLAI
EPSS
VEX
Title
AnythingLLM: Stored XSS Due to Unescaped Server-Side HTML Concatenation in MetaGenerator
Summary
AnythingLLM is an application that turns pieces of content into context that any LLM can use as references during chatting. In 1.16.1 and earlier, the manager role can store meta_page_title or meta_page_favicon through /api/admin/system-preferences, and MetaGenerator inserts those values into production homepage HTML without escaping attribute values or text content. The values pass unchanged through server/models/systemSettings.js and reach MetaGenerator.generate() in server/index.js. #assembleMeta() in server/utils/boot/MetaGenerator.js concatenates the stored values into HTML. When an administrator visits the homepage /, injected JavaScript can read the administrator JWT and use it to create API keys, access or modify workspace and chat data, delete users, and perform other administrator actions. server/endpoints/admin.js accepts the manager-controlled settings before server/models/systemSettings.js returns them unchanged. No fixed version is available as of this review.
Severity
5.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 18:15 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/Mintplex-Labs/anything-llm/sec… | x_refsource_CONFIRM |
| https://github.com/Mintplex-Labs/anything-llm/com… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mintplex-Labs | anything-llm |
Affected:
<= 1.16.1
|
{
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}
],
"title": "CISA ADP Vulnrichment"
}
],
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"vendor": "Mintplex-Labs",
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{
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"version": "\u003c= 1.16.1"
}
]
}
],
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}
],
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"attackVector": "NETWORK",
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"baseScore": 5.5,
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"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
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"scope": "CHANGED",
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"version": "3.1"
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}
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"type": "CWE"
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},
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{
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"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/Mintplex-Labs/anything-llm/security/advisories/GHSA-rh3m-xv7m-9jhf"
},
{
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"tags": [
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],
"url": "https://github.com/Mintplex-Labs/anything-llm/commit/6dff9d71ab585e87a3145a48abc63c2b60151149"
}
],
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"discovery": "UNKNOWN"
},
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}
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CVE-2026-88037 (GCVE-0-2026-88037)
Vulnerability from cvelistv5 – Published: 2026-09-30 07:41 – Updated: 2026-09-30 15:28
VLAI
EPSS
VEX
Title
Bold Page Builder <= 5.7.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via bt_bb_service title
Summary
The Bold Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `title` attribute of the `bt_bb_service` shortcode in all versions up to, and including, 5.7.2. This is due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Severity
6.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 12:54 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| boldthemes | Bold Page Builder |
Affected:
0 , ≤ 5.7.2
(semver)
|
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CVE-2026-88020 (GCVE-0-2026-88020)
Vulnerability from cvelistv5 – Published: 2026-09-22 20:40 – Updated: 2026-09-23 15:05
VLAI
EPSS
VEX
Title
Improper Neutralization of Input During Web Page Generation in OpenPLC Runtime v3
Summary
Autonomy Logic OpenPLC 3 is susceptible to an improper neutralization of input during web page generation vulnerability when the web interface attempts to route the program based on a query string parameter with no encoding.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 15:05 UTC
CWE
- CWE-79 - Improper neutralization of input during web page generation ('cross-site scripting')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Autonomy Logic | OpenPLC Runtime |
Affected:
3
Unaffected: 4 |
Date Public
2026-09-22 17:53
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CVE-2026-87995 (GCVE-0-2026-87995)
Vulnerability from cvelistv5 – Published: 2026-09-09 21:26 – Updated: 2026-09-10 17:54
VLAI
EPSS
VEX
Title
Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin
Summary
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.11 until 0.11.1, src/lib/components/chat/FileNav/PortPreview.svelte rendered terminal port content in an iframe sandbox containing both allow-scripts and allow-same-origin. Because the terminal proxy serves that content from the Open WebUI origin, an authenticated user with access to a shared terminal server could host script on a previewed port and take over a victim's account when the victim opened the preview. This issue is fixed in version 0.11.1.
Severity
8.7 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 17:54 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/open-webui/open-webui/security… | x_refsource_CONFIRM |
| https://github.com/open-webui/open-webui/commit/5… | x_refsource_MISC |
| https://github.com/open-webui/open-webui/releases… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| open-webui | open-webui |
Affected:
>= 0.8.11, < 0.11.1
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CVE-2026-87926 (GCVE-0-2026-87926)
Vulnerability from cvelistv5 – Published: 2026-09-09 23:30 – Updated: 2026-09-14 18:41
VLAI
EPSS
VEX
Title
Rizwan17 inventory-management-system Login Page index.php cross site scripting
Summary
A flaw has been found in Rizwan17 inventory-management-system up to bfe78a330d01bb26b9daec5dc9ecd5c77900e03f. This issue affects some unknown processing of the file index.php of the component Login Page. Executing a manipulation of the argument msg can lead to cross site scripting. The attack can be launched remotely. The exploit has been published and may be used. This product does not use versioning. This is why information about affected and unaffected releases are unavailable. The project was informed of the problem early through an issue report but has not responded yet.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 17:12 UTC
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/401813 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/401813/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-87926 | third-party-advisory |
| https://vuldb.com/submit/911140 | third-party-advisory |
| https://github.com/Rizwan17/inventory-management-… | exploitissue-tracking |
| https://github.com/Rizwan17/inventory-management-… | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Rizwan17 | inventory-management-system |
Affected:
bfe78a330d01bb26b9daec5dc9ecd5c77900e03f
cpe:2.3:a:rizwan17:inventory-management-system:*:*:*:*:*:*:*:* |
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Mitigation MIT-4
Architecture and Design
Strategy: Libraries or Frameworks
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].
- Examples of libraries and frameworks that make it easier to generate properly encoded output include Microsoft's Anti-XSS library, the OWASP ESAPI Encoding module, and Apache Wicket.
Mitigation
Implementation
Architecture and Design
- Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages. Study all expected communication protocols and data representations to determine the required encoding strategies.
- For any data that will be output to another web page, especially any data that was received from external inputs, use the appropriate encoding on all non-alphanumeric characters.
- Parts of the same output document may require different encodings, which will vary depending on whether the output is in the:
- etc. Note that HTML Entity Encoding is only appropriate for the HTML body.
- Consult the XSS Prevention Cheat Sheet [REF-724] for more details on the types of encoding and escaping that are needed.
- HTML body
- Element attributes (such as src="XYZ")
- URIs
- JavaScript sections
- Cascading Style Sheets and style property
Mitigation MIT-6
Architecture and Design
Implementation
Strategy: Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly through API calls.
Mitigation MIT-15
Architecture and Design
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
Mitigation MIT-27
Architecture and Design
Strategy: Parameterization
If available, use structured mechanisms that automatically enforce the separation between data and code. These mechanisms may be able to provide the relevant quoting, encoding, and validation automatically, instead of relying on the developer to provide this capability at every point where output is generated.
Mitigation MIT-30.1
Implementation
Strategy: Output Encoding
- Use and specify an output encoding that can be handled by the downstream component that is reading the output. Common encodings include ISO-8859-1, UTF-7, and UTF-8. When an encoding is not specified, a downstream component may choose a different encoding, either by assuming a default encoding or automatically inferring which encoding is being used, which can be erroneous. When the encodings are inconsistent, the downstream component might treat some character or byte sequences as special, even if they are not special in the original encoding. Attackers might then be able to exploit this discrepancy and conduct injection attacks; they even might be able to bypass protection mechanisms that assume the original encoding is also being used by the downstream component.
- The problem of inconsistent output encodings often arises in web pages. If an encoding is not specified in an HTTP header, web browsers often guess about which encoding is being used. This can open up the browser to subtle XSS attacks.
Mitigation MIT-43
Implementation
With Struts, write all data from form beans with the bean's filter attribute set to true.
Mitigation MIT-31
Implementation
Strategy: Attack Surface Reduction
To help mitigate XSS attacks against the user's session cookie, set the session cookie to be HttpOnly. In browsers that support the HttpOnly feature (such as more recent versions of Internet Explorer and Firefox), this attribute can prevent the user's session cookie from being accessible to malicious client-side scripts that use document.cookie. This is not a complete solution, since HttpOnly is not supported by all browsers. More importantly, XmlHttpRequest and other powerful browser technologies provide read access to HTTP headers, including the Set-Cookie header in which the HttpOnly flag is set.
Mitigation MIT-5
Implementation
Strategy: Input Validation
- Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
- When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
- Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
- When dynamically constructing web pages, use stringent allowlists that limit the character set based on the expected value of the parameter in the request. All input should be validated and cleansed, not just parameters that the user is supposed to specify, but all data in the request, including hidden fields, cookies, headers, the URL itself, and so forth. A common mistake that leads to continuing XSS vulnerabilities is to validate only fields that are expected to be redisplayed by the site. It is common to see data from the request that is reflected by the application server or the application that the development team did not anticipate. Also, a field that is not currently reflected may be used by a future developer. Therefore, validating ALL parts of the HTTP request is recommended.
- Note that proper output encoding, escaping, and quoting is the most effective solution for preventing XSS, although input validation may provide some defense-in-depth. This is because it effectively limits what will appear in output. Input validation will not always prevent XSS, especially if you are required to support free-form text fields that could contain arbitrary characters. For example, in a chat application, the heart emoticon ("<3") would likely pass the validation step, since it is commonly used. However, it cannot be directly inserted into the web page because it contains the "<" character, which would need to be escaped or otherwise handled. In this case, stripping the "<" might reduce the risk of XSS, but it would produce incorrect behavior because the emoticon would not be recorded. This might seem to be a minor inconvenience, but it would be more important in a mathematical forum that wants to represent inequalities.
- Even if you make a mistake in your validation (such as forgetting one out of 100 input fields), appropriate encoding is still likely to protect you from injection-based attacks. As long as it is not done in isolation, input validation is still a useful technique, since it may significantly reduce your attack surface, allow you to detect some attacks, and provide other security benefits that proper encoding does not address.
- Ensure that you perform input validation at well-defined interfaces within the application. This will help protect the application even if a component is reused or moved elsewhere.
Mitigation MIT-21
Architecture and Design
Strategy: Enforcement by Conversion
When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
Mitigation MIT-29
Operation
Strategy: Firewall
Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].
Mitigation MIT-16
Operation
Implementation
Strategy: Environment Hardening
When using PHP, configure the application so that it does not use register_globals. During implementation, develop the application so that it does not rely on this feature, but be wary of implementing a register_globals emulation that is subject to weaknesses such as CWE-95, CWE-621, and similar issues.
CAPEC-209: XSS Using MIME Type Mismatch
An adversary creates a file with scripting content but where the specified MIME type of the file is such that scripting is not expected. The adversary tricks the victim into accessing a URL that responds with the script file. Some browsers will detect that the specified MIME type of the file does not match the actual type of its content and will automatically switch to using an interpreter for the real content type. If the browser does not invoke script filters before doing this, the adversary's script may run on the target unsanitized, possibly revealing the victim's cookies or executing arbitrary script in their browser.
CAPEC-588: DOM-Based XSS
This type of attack is a form of Cross-Site Scripting (XSS) where a malicious script is inserted into the client-side HTML being parsed by a web browser. Content served by a vulnerable web application includes script code used to manipulate the Document Object Model (DOM). This script code either does not properly validate input, or does not perform proper output encoding, thus creating an opportunity for an adversary to inject a malicious script launch a XSS attack. A key distinction between other XSS attacks and DOM-based attacks is that in other XSS attacks, the malicious script runs when the vulnerable web page is initially loaded, while a DOM-based attack executes sometime after the page loads. Another distinction of DOM-based attacks is that in some cases, the malicious script is never sent to the vulnerable web server at all. An attack like this is guaranteed to bypass any server-side filtering attempts to protect users.
CAPEC-591: Reflected XSS
This type of attack is a form of Cross-Site Scripting (XSS) where a malicious script is "reflected" off a vulnerable web application and then executed by a victim's browser. The process starts with an adversary delivering a malicious script to a victim and convincing the victim to send the script to the vulnerable web application.
CAPEC-592: Stored XSS
An adversary utilizes a form of Cross-site Scripting (XSS) where a malicious script is persistently "stored" within the data storage of a vulnerable web application as valid input.
CAPEC-63: Cross-Site Scripting (XSS)
An adversary embeds malicious scripts in content that will be served to web browsers. The goal of the attack is for the target software, the client-side browser, to execute the script with the users' privilege level. An attack of this type exploits a programs' vulnerabilities that are brought on by allowing remote hosts to execute code and scripts. Web browsers, for example, have some simple security controls in place, but if a remote attacker is allowed to execute scripts (through injecting them in to user-generated content like bulletin boards) then these controls may be bypassed. Further, these attacks are very difficult for an end user to detect.
CAPEC-85: AJAX Footprinting
This attack utilizes the frequent client-server roundtrips in Ajax conversation to scan a system. While Ajax does not open up new vulnerabilities per se, it does optimize them from an attacker point of view. A common first step for an attacker is to footprint the target environment to understand what attacks will work. Since footprinting relies on enumeration, the conversational pattern of rapid, multiple requests and responses that are typical in Ajax applications enable an attacker to look for many vulnerabilities, well-known ports, network locations and so on. The knowledge gained through Ajax fingerprinting can be used to support other attacks, such as XSS.