Common Weakness Enumeration
CWE-303
AllowedIncorrect Implementation of Authentication Algorithm
Abstraction: Base · Status: Draft
The requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect.
186 vulnerabilities reference this CWE, most recent first.
CVE-2026-27656 (GCVE-0-2026-27656)
Vulnerability from cvelistv5 – Published: 2026-03-25 16:28 – Updated: 2026-03-26 13:19
VLAI
EPSS
VEX
Title
Account Takeover via Substring Matching in OpenID Connect Authentication
Summary
Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to properly validate user identity in the OpenID {{IsSameUser()}} comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user discovery flow.. Mattermost Advisory ID: MMSA-2026-00590
Severity
5.7 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-26 03:55 UTC
CWE
- CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.4.0 , ≤ 11.4.0
(semver)
Affected: 11.3.0 , ≤ 11.3.1 (semver) Affected: 11.2.0 , ≤ 11.2.3 (semver) Affected: 10.11.0 , ≤ 10.11.11 (semver) Unaffected: 11.5.0 Unaffected: 11.4.1 Unaffected: 11.3.2 Unaffected: 11.2.4 Unaffected: 10.11.12 |
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CVE-2026-15688 (GCVE-0-2026-15688)
Vulnerability from cvelistv5 – Published: 2026-09-17 08:15 – Updated: 2026-09-17 12:25
VLAI
EPSS
VEX
Title
Password Authentication Bypass Vulnerability in GX Works3 and Motion Control Setting
Summary
Incorrect Implementation of Authentication Algorithm Vulnerability in Mitsubishi Electric GX Works3 and Motion Control Setting allows a local attacker to successfully authenticate even with an invalid block password by executing the affected product and modifying part of the executable module in memory, and thereby may be able to view, tamper with, destroy, or delete control programs.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 12:24 UTC
CWE
- CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.mitsubishielectric.com/psirt/vulnerab… | vendor-advisory |
| https://jvn.jp/vu/JVNVU99700314 | government-resource |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Mitsubishi Electric Corporation | GX Works3 |
Affected:
All versions
|
|
| Mitsubishi Electric Corporation | Motion Control Setting |
Affected:
All versions
|
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CVE-2026-11430 (GCVE-0-2026-11430)
Vulnerability from cvelistv5 – Published: 2026-08-07 19:02 – Updated: 2026-10-01 21:44
VLAI
EPSS
VEX
Title
Grav CMS Scheduler Webhook Authentication Bypass via Null Short-Circuit
Summary
Grav CMS's scheduler-webhook plugin contains an authentication bypass in the webhook token check. When the webhook feature is enabled but no webhookToken is configured, a compound conditional short-circuits and skips token validation, so an unauthenticated remote attacker who can reach POST /scheduler/webhook can trigger the operator's already-configured scheduled jobs by sending a single request. The primitive is triggering-existing-jobs, not attacker-chosen command execution: the attacker controls when the jobs run and which one runs (via ?job=), but does not control what the jobs do. Code execution follows only when the operator has configured a job that shells out, and even then the attacker controls timing rather than payload. Not a default-install issue: reaching the endpoint requires the separate scheduler-webhook GPM plugin to be installed, scheduler.modern.webhook.enabled to be true (default false), and no webhookToken to be configured; a stock Grav or Grav-Admin install exposes nothing here.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-07 20:56 UTC
CWE
- CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/getgrav/grav/security/advisori… | technical-description |
| https://github.com/getgrav/grav | product |
| https://github.com/getgrav/grav/commit/694f1dae06… | patch |
| https://www.vulncheck.com/advisories/grav-cms-sch… | third-party-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Trilby Media | grav-plugin-scheduler-webhook |
Affected:
0 , < 1.1.3
(semver)
|
|
| Trilby Media | getgrav/grav |
Affected:
0 , < 2.0.9
(semver)
|
Date Public
2026-08-07 00:00
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CVE-2026-10050 (GCVE-0-2026-10050)
Vulnerability from cvelistv5 – Published: 2026-08-04 11:02 – Updated: 2026-08-04 12:46
VLAI
EPSS
VEX
Title
Digest authentication lossy encoding
Summary
In Eclipse Jetty, the Digest authentication server-side component uses ISO-8859-1 to encode the password as bytes.
This was done because the initial specification for HTTP did not specify explicitly a charset, and it was assumed to be ISO-8859-1 for historical reasons.
If the password contains characters that cannot be represented in ISO-8859-1, they are silently replaced by `?`. This happens with passwords that contain Chinese, Cyrillic or Greek characters, for example: `αβ123` converts to `??123`.
An attacker can send a request with a digest `Authorization` header crafted with a password made of only `?` characters; the server would match any password of the same length that contains non-ISO-8859-1 characters.
Recent HTTP Digest [RFC-7616](https://datatracker.ietf.org/doc/html/rfc7616) supports a `charset` parameters that defaults to UTF-8 that allows for correct encoding/decoding of passwords.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-04 12:45 UTC
Assigner
References
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| Eclipse Foundation | Eclipse Jetty - EE8 |
Affected:
12.0.0 , ≤ 12.0.35
(semver)
Affected: 12.1.0 , ≤ 12.1.9 (semver) |
|
| Eclipse Foundation | Eclipse Jetty - EE9 |
Affected:
12.0.0 , ≤ 12.0.35
(semver)
Affected: 12.1.0 , ≤ 12.1.9 (semver) |
|
| Eclipse Foundation | Eclipse Jetty |
Affected:
9.4.0 , ≤ 9.4.62
(semver)
Affected: 10.0.0 , ≤ 10.0.30 (semver) Affected: 11.0.0 , ≤ 11.0.30 (semver) Affected: 12.0.0 , ≤ 12.0.35 (semver) Affected: 12.1.0 , ≤ 12.1.9 (semver) |
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CVE-2026-9854 (GCVE-0-2026-9854)
Vulnerability from cvelistv5 – Published: 2026-09-03 07:55 – Updated: 2026-09-03 12:48
VLAI
EPSS
VEX
Summary
A vulnerability exists in SYS600 RBAC mechanism where users having access to the engineering tools could elevate their privileges to administrator level on the underlying Windows host, granting themselves full control over the host machine.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-03 12:48 UTC
CWE
- CWE-303 - Incorrect implementation of authentication algorithm
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Hitachi Energy | MicroSCADA SYS600 |
Affected:
10.0 , ≤ 10.7
(custom)
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CVE-2026-9853 (GCVE-0-2026-9853)
Vulnerability from cvelistv5 – Published: 2026-09-03 07:53 – Updated: 2026-09-03 12:49
VLAI
EPSS
VEX
Summary
A vulnerability exists in SYS600 which allows any user authenticated to the operating system of the server hosting the application to read and modify application objects without being authenticated to the SYS600 system itself.
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Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-03 12:49 UTC
CWE
- CWE-303 - Incorrect implementation of authentication algorithm
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Hitachi Energy | MicroSCADA SYS600 |
Affected:
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CVE-2026-8922 (GCVE-0-2026-8922)
Vulnerability from cvelistv5 – Published: 2026-05-19 06:27 – Updated: 2026-06-26 06:46
VLAI
EPSS
VEX
Title
Org.keycloak/keycloak-services: keycloak: org.keycloak.protocol.oidc: security flaw in org.keycloak/keycloak-services
Summary
A flaw was found in Keycloak. When both realm-level and client-level `notBefore` revocation policies are configured, Keycloak's OpenID Connect (OIDC) Introspection feature fails to properly honor the realm-level policy. This allows tokens that should have been revoked to remain active, potentially leading to unauthorized access or continued session validity. This could impact the security of systems utilizing Keycloak for identity and access management.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-19 12:53 UTC
CWE
- CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:25097 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:25098 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:30049 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:30050 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-8922 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2479586 | issue-trackingx_refsource_REDHAT |
Impacted products
6 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat build of Keycloak 26.4 |
Unaffected:
26.4.13-1 , < *
(rpm)
cpe:/a:redhat:build_keycloak:26.4::el9 |
|
| Red Hat | Red Hat build of Keycloak 26.4 |
Unaffected:
26.4-19 , < *
(rpm)
cpe:/a:redhat:build_keycloak:26.4::el9 |
|
| Red Hat | Red Hat build of Keycloak 26.4.13 |
cpe:/a:redhat:build_keycloak:26.4::el9
|
|
| Red Hat | Red Hat build of Keycloak 26.6 |
Unaffected:
26.6.3-3 , < *
(rpm)
cpe:/a:redhat:build_keycloak:26.6::el9 |
|
| Red Hat | Red Hat build of Keycloak 26.6 |
Unaffected:
26.6-6 , < *
(rpm)
cpe:/a:redhat:build_keycloak:26.6::el9 |
|
| Red Hat | Red Hat build of Keycloak 26.6.3 |
cpe:/a:redhat:build_keycloak:26.6::el9
|
Date Public
2026-05-19 06:22
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CVE-2026-3869 (GCVE-0-2026-3869)
Vulnerability from cvelistv5 – Published: 2026-09-11 15:13 – Updated: 2026-09-11 19:14
VLAI
EPSS
VEX
Summary
CWE-303 : Incorrect Implementation of Authentication Algorithm vulnerability exists that could cause loss of confidentiality, integrity and availability of the PLC provided an application project with a lower application level is running on the PLC.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-11 19:14 UTC
CWE
- CWE-303 - Incorrect implementation of authentication algorithm
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Schneider Electric | Modicon M580 |
Affected:
All versions with an application level below 4.00
|
|
| Schneider Electric | Modicon M580 Safety |
Affected:
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CVE-2026-0999 (GCVE-0-2026-0999)
Vulnerability from cvelistv5 – Published: 2026-02-16 09:47 – Updated: 2026-02-17 16:53
VLAI
EPSS
VEX
Title
Authentication bypass via userID login when email and username login are disabled
Summary
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate login method restrictions which allows an authenticated user to bypass SSO-only login requirements via userID-based authentication. Mattermost Advisory ID: MMSA-2025-00548
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-17 16:52 UTC
CWE
- CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.1.0 , ≤ 11.1.2
(semver)
Affected: 10.11.0 , ≤ 10.11.9 (semver) Affected: 11.2.0 , ≤ 11.2.1 (semver) Unaffected: 11.3.0 Unaffected: 11.1.3 Unaffected: 10.11.10 Unaffected: 11.2.2 |
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CVE-2025-66489 (GCVE-0-2025-66489)
Vulnerability from cvelistv5 – Published: 2025-12-03 19:44 – Updated: 2025-12-03 21:48
VLAI
EPSS
VEX
Title
Cal.com Authentication Bypass via bad TOTP + password checks
Summary
Cal.com is open-source scheduling software. Prior to 5.9.8, A flaw in the login credentials provider allows an attacker to bypass password verification when a TOTP code is provided, potentially gaining unauthorized access to user accounts. This issue exists due to problematic conditional logic in the authentication flow. This vulnerability is fixed in 5.9.8.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-03 21:48 UTC
CWE
- CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/calcom/cal.com/security/adviso… | x_refsource_CONFIRM |
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No mitigation information available for this CWE.
CAPEC-90: Reflection Attack in Authentication Protocol
An adversary can abuse an authentication protocol susceptible to reflection attack in order to defeat it. Doing so allows the adversary illegitimate access to the target system, without possessing the requisite credentials. Reflection attacks are of great concern to authentication protocols that rely on a challenge-handshake or similar mechanism. An adversary can impersonate a legitimate user and can gain illegitimate access to the system by successfully mounting a reflection attack during authentication.