{"id":"CVE-2026-61559","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-61559","summary":"`@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`…","details":"`@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.","published":"2026-09-15T21:16:41.390","modified":"2026-09-15T21:16:41.390","cvss":{"score":9.6,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/zereight/gitlab-mcp/commit/6ffb4cc70706fd05b1ab80901676bc2998b6db6d","label":"zereight/gitlab-mcp@6ffb4cc"},"references":[{"type":"WEB","url":"https://github.com/zereight/gitlab-mcp/commit/6ffb4cc70706fd05b1ab80901676bc2998b6db6d"},{"type":"WEB","url":"https://github.com/zereight/gitlab-mcp/pull/625"},{"type":"WEB","url":"https://github.com/zereight/gitlab-mcp/releases/tag/v2.1.27"},{"type":"WEB","url":"https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-2h44-8472-frjj"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-15T21:16:41.390"}}