{"id":"CVE-2026-61559","state":"PUBLISHED","title":"@zereight/mcp-gitlab Vulnerable to Server-Side Request Forgery","description":"`@zereight/mcp-gitlab` is a Model Context Protocol server for GitLab. Starting in version 0.0.1 and prior to version 2.1.27, when the environment variable `ENABLE_DYNAMIC_API_URL=true` is set, the server reads the `X-GitLab-API-URL` HTTP request header and uses it as the base URL for all outbound GitLab API calls made within that request. The server validates that the value is a well-formed URL (`new URL(dynamicApiUrl)`) but applies no allowlist or hostname restriction. The server then attaches the victim's `Private-Token` to every outbound fetch that uses the redirected URL. Any caller who can reach the HTTP transport can set `X-GitLab-API-URL` to an attacker-controlled host. The next GitLab API call the server makes delivers the victim's token to that host. Version 2.1.27 contains a patch.","publishedAt":"2026-09-15T20:58:41.639Z","updatedAt":"2026-09-17T16:50:15.672Z","severity":{"score":9.6,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["zereight gitlab-mcp"],"affected":[{"vendor":"zereight","product":"gitlab-mcp","versions":[{"version":">= 0.0.1, < 2.1.27","status":"affected"}]}],"references":["https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-2h44-8472-frjj","https://github.com/zereight/gitlab-mcp/pull/625","https://github.com/zereight/gitlab-mcp/commit/6ffb4cc70706fd05b1ab80901676bc2998b6db6d","https://github.com/zereight/gitlab-mcp/releases/tag/v2.1.27"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/61xxx/CVE-2026-61559.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-61559","state":"PUBLISHED","datePublished":"2026-09-15T20:58:41.639Z","dateUpdated":"2026-09-17T16:50:15.672Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-10T16:48:39.923Z"},"containers":{"cna":{"title":"@zereight/mcp-gitlab Vulnerable to Server-Side Request Forgery","descriptions":[{"lang":"en","value":"`@zereight/mcp-gitlab` is a Model Context Protocol server for GitLab. Starting in version 0.0.1 and prior to version 2.1.27, when the environment variable `ENABLE_DYNAMIC_API_URL=true` is set, the server reads the `X-GitLab-API-URL` HTTP request header and uses it as the base URL for all outbound GitLab API calls made within that request. The server validates that the value is a well-formed URL (`new URL(dynamicApiUrl)`) but applies no allowlist or hostname restriction. The server then attaches the victim's `Private-Token` to every outbound fetch that uses the redirected URL. Any caller who can reach the HTTP transport can set `X-GitLab-API-URL` to an attacker-controlled host. The next GitLab API call the server makes delivers the victim's token to that host. Version 2.1.27 contains a patch."}],"affected":[{"vendor":"zereight","product":"gitlab-mcp","versions":[{"version":">= 0.0.1, < 2.1.27","status":"affected"}]}],"references":[{"url":"https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-2h44-8472-frjj","name":"https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-2h44-8472-frjj","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/zereight/gitlab-mcp/pull/625","name":"https://github.com/zereight/gitlab-mcp/pull/625","tags":["x_refsource_MISC"]},{"url":"https://github.com/zereight/gitlab-mcp/commit/6ffb4cc70706fd05b1ab80901676bc2998b6db6d","name":"https://github.com/zereight/gitlab-mcp/commit/6ffb4cc70706fd05b1ab80901676bc2998b6db6d","tags":["x_refsource_MISC"]},{"url":"https://github.com/zereight/gitlab-mcp/releases/tag/v2.1.27","name":"https://github.com/zereight/gitlab-mcp/releases/tag/v2.1.27","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.6,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-15T20:58:41.639Z"},"source":{"advisory":"GHSA-2h44-8472-frjj","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-2h44-8472-frjj","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-17T16:49:44.156114Z","id":"CVE-2026-61559","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-17T16:50:15.672Z"}}]}}}