CVE-2026-61559
critical`@zereight/mcp-gitlab` is a Model Context Protocol server for GitLab.
`@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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/zereight/gitlab-mcp/commit/6ffb4cc70706fd05b1ab80901676bc2998b6db6d security-advisories@github.com
- https://github.com/zereight/gitlab-mcp/pull/625 security-advisories@github.com
- https://github.com/zereight/gitlab-mcp/releases/tag/v2.1.27 security-advisories@github.com
- https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-2h44-8472-frjj security-advisories@github.com
- https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-2h44-8472-frjj 134c704f-9b21-4f2e-91b3-4a467353bcc0