Common Weakness Enumeration

CWE-918

Allowed

Server-Side Request Forgery (SSRF)

Abstraction: Base · Status: Incomplete

API response cwe.mitre.org

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

6243 vulnerabilities reference this CWE, most recent first.

CVE-2026-77274 (GCVE-0-2026-77274)

Vulnerability from cvelistv5 – Published: 2026-09-22 17:36 – Updated: 2026-09-22 18:32
VLAI
Title
MCP Atlassian: SSRF Protection Bypass
Summary
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, validate_url_for_ssrf has a backslash authority confusion because it interprets the authority differently from the Requests connection layer in the header-based Jira and Confluence URL authentication flow. A crafted URL can validate as an external hostname while the HTTP client connects to an internal host, permitting server-side requests to protected network resources. This issue is fixed in version 0.22.0.
Severity
8.8 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-22 18:31 UTC
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
Impacted products
Vendor Product Version
sooperset mcp-atlassian Affected: < 0.22.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-77267 (GCVE-0-2026-77267)

Vulnerability from cvelistv5 – Published: 2026-09-22 17:52 – Updated: 2026-09-28 17:18
VLAI
Title
mcp-atlassian has an incomplete SSRF remediation
Summary
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url headers are processed by _process_authentication_headers and used to construct Atlassian fetchers without calling validate_url_for_ssrf. A caller who can set these headers can supply an internal or metadata-service URL and cause the server to send requests to that destination, bypassing the incomplete CVE-2026-27826 remediation. This issue is fixed in version 0.22.0.
Severity
8.3 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-28 17:18 UTC
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
Impacted products
Vendor Product Version
sooperset mcp-atlassian Affected: < 0.22.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-77265 (GCVE-0-2026-77265)

Vulnerability from cvelistv5 – Published: 2026-09-22 17:47 – Updated: 2026-09-28 17:46
VLAI
Title
MCP Atlassian: SSRF via DNS Rebinding in Header-Based Authentication Flow
Summary
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, header-supplied Jira or Confluence URLs are resolved and validated before the HTTP client resolves the hostname again for the connection. An unauthenticated caller can use a DNS-rebinding hostname that returns a public address during validation and an internal address during connection, causing requests to internal or metadata services. The advisory traces the vulnerable input and processing flow through X-Atlassian-Jira-Url, X-Atlassian-Confluence-Url, validate_url_for_ssrf, and DNS rebinding, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-28 17:46 UTC
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
Impacted products
Vendor Product Version
sooperset mcp-atlassian Affected: < 0.22.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-77261 (GCVE-0-2026-77261)

Vulnerability from cvelistv5 – Published: 2026-09-22 18:06 – Updated: 2026-09-23 14:38
VLAI
Title
MCP Atlassian: SSRF redirect protection missing for basic-auth and OAuth authentication branches
Summary
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, _make_ssrf_safe_hook is omitted from JiraFetcher and ConfluenceFetcher sessions created through the basic-auth and oauth_pat branches. If an attacker-controlled or compromised configured Atlassian instance returns a redirect to an internal address, those sessions can follow the redirect without revalidating its destination. This issue is fixed in version 0.22.0.
Severity
7.1 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-22 19:07 UTC
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
Impacted products
Vendor Product Version
sooperset mcp-atlassian Affected: < 0.22.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-77249 (GCVE-0-2026-77249)

Vulnerability from cvelistv5 – Published: 2026-09-22 18:47 – Updated: 2026-09-22 19:36
VLAI
Title
MCP Atlassian: Incomplete fix for CVE-2026-27826: redirect-based SSRF via unhooked requests session in Jira user-permission lookup
Summary
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, JiraUserMixin._lookup_user_by_permissions uses the module-level requests.get function instead of the fetcher's protected session. A caller-controlled public Jira URL can redirect that unhooked request to an internal address, bypassing the redirect checks added for CVE-2026-27826. The advisory traces the vulnerable input and processing flow through JiraUserMixin._lookup_user_by_permissions, requests.get, self.jira._session.get, and _make_ssrf_safe_hook, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-22 19:35 UTC
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
Impacted products
Vendor Product Version
sooperset mcp-atlassian Affected: < 0.22.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-77242 (GCVE-0-2026-77242)

Vulnerability from cvelistv5 – Published: 2026-09-22 17:58 – Updated: 2026-09-22 18:49
VLAI
Title
MCP Atlassian: Incomplete fix for CVE-2026-27826: DNS rebinding bypasses SSRF validation (validated IP not pinned)
Summary
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, validate_url_for_ssrf checks a hostname's resolved addresses, but Requests and urllib3 resolve the hostname again when connecting. A caller can use a short-lived DNS answer that is public during validation and private during connection, preserving unauthenticated access to internal or metadata endpoints despite the earlier CVE-2026-27826 remediation. The advisory traces the vulnerable input and processing flow through validate_url_for_ssrf, _check_dns_resolution, socket.getaddrinfo, and _make_ssrf_safe_hook, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-22 18:48 UTC
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
Impacted products
Vendor Product Version
sooperset mcp-atlassian Affected: < 0.22.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-77164 (GCVE-0-2026-77164)

Vulnerability from cvelistv5 – Published: 2026-09-18 01:26 – Updated: 2026-09-18 19:41
VLAI
Summary
Circles' remote-instance signature verification fetches the attacker-supplied keyId URL before trust in the remote instance is established, and explicitly allows local/private addresses for this request, bypassing Nextcloud's core SSRF protections. The public, unauthenticated endpoints POST /apps/circles/event/ and POST /apps/circles/incoming/ reach this code path, allowing any unauthenticated user to force the server to issue a GET request to an internal address. The response body of the internal request is never returned to the requester, so this is blind SSRF: an attacker can determine whether an internal service is reachable, but cannot read its response contents through this endpoint alone.
Severity
6.2 (Medium)
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 19:40 UTC
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
Impacted products
Vendor Product Version
Nextcloud Server Affected: 31.0.0 , ≤ 32.0.0 (semver)
Create a notification for this product.
Credits
Balvant Chavda (0x0doteth)
Show details on NVD website
To clipboard 

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CVE-2026-77112 (GCVE-0-2026-77112)

Vulnerability from cvelistv5 – Published: 2026-09-23 12:07 – Updated: 2026-09-23 12:39
VLAI
Title
SSRF Leading to JWT Token Disclosure in Global IT Informatics' Weoll
Summary
Server-Side request forgery (SSRF) vulnerability in Global IT Informatics Technology Services Inc. Weoll allows Server Side Request Forgery. This issue affects Weoll: before 3.2.45.44.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 12:39 UTC
CWE
  • CWE-918 - Server-Side request forgery (SSRF)
Assigner
References
Impacted products
Date Public
2026-09-23 12:02
Credits
Hamza Metin Gerdan
Show details on NVD website
To clipboard 

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CVE-2026-77085 (GCVE-0-2026-77085)

Vulnerability from cvelistv5 – Published: 2026-08-20 11:21 – Updated: 2026-08-21 11:21
VLAI
Title
n8n before 2.34.1 SSRF Protection Bypass via SearXNG Tool
Summary
n8n before 2.34.1 and 2.33.x before 2.33.4 contains an SSRF protection bypass in the SearXNG Agent tool. The tool sent requests to the user-supplied API URL using a raw HTTP client that did not route through n8n's centralized SSRF protection. On instances with N8N_SSRF_PROTECTION_ENABLED=true, an authenticated user with permission to create SearXNG credentials and configure a personal agent could set the API URL to an internal host, causing the n8n server to connect to that host and return the response content through the Agent chat output.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 12:02 UTC
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
Impacted products
Vendor Product Version
n8n-io n8n Affected: 2.34.0 , < 2.34.1 (semver)
Unaffected: 2.34.1 (semver)
Create a notification for this product.
n8n-io n8n Affected: 2.0.0 , < 2.33.4 (semver)
Unaffected: 2.33.4 (semver)
Create a notification for this product.
Date Public
2026-08-05 00:00
Show details on NVD website
To clipboard 

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CVE-2026-77069 (GCVE-0-2026-77069)

Vulnerability from cvelistv5 – Published: 2026-08-20 11:21 – Updated: 2026-08-21 11:21
VLAI
Title
n8n before 1.123.69 SSRF Protection Bypass via OAuth2
Summary
n8n before 1.123.69, 2.33.4, and 2.34.1 contains an SSRF protection bypass in the OAuth2 credential authorization-code-to-access-token exchange. While OAuth2 discovery and dynamic-client-registration requests use n8n's SSRF-protected HTTP client, the token exchange uses a separate client with no SSRF guard. A user with credential-creation permissions can set the access-token URL to an internal address and complete the OAuth2 flow, causing n8n to send a fixed-shape token-exchange POST to that target and reflect its response body back to the attacker (limited to what the target returns to this specific request).
Severity
2.3 (Low)
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 15:38 UTC
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
Impacted products
Vendor Product Version
n8n-io n8n Affected: 0 , < 1.123.69 (semver)
Unaffected: 1.123.69 (semver)
Create a notification for this product.
n8n-io n8n Affected: 2.34.0 , < 2.34.1 (semver)
Unaffected: 2.34.1 (semver)
Create a notification for this product.
n8n-io n8n Affected: 2.0.0 , < 2.33.4 (semver)
Unaffected: 2.33.4 (semver)
Create a notification for this product.
Date Public
2026-08-05 00:00
Credits
Pr0ph3t3
Show details on NVD website
To clipboard 

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No mitigation information available for this CWE.

CAPEC-664: Server Side Request Forgery

An adversary exploits improper input validation by submitting maliciously crafted input to a target application running on a server, with the goal of forcing the server to make a request either to itself, to web services running in the server’s internal network, or to external third parties. If successful, the adversary’s request will be made with the server’s privilege level, bypassing its authentication controls. This ultimately allows the adversary to access sensitive data, execute commands on the server’s network, and make external requests with the stolen identity of the server. Server Side Request Forgery attacks differ from Cross Site Request Forgery attacks in that they target the server itself, whereas CSRF attacks exploit an insecure user authentication mechanism to perform unauthorized actions on the user's behalf.

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