CVE-2026-61560

Published: Sep 15, 2026Modified: Sep 30, 2026Deferred

9.8

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitability: 3.9 / Impact: 5.9

Source: security-advisories@github.com (Secondary)

Description

`@zereight/mcp-gitlab` is a Model Context Protocol server for GitLab. Prior to version 2.1.27, the SSE transport mode (`SSE=true`) exposes all MCP tools without any authentication. The `upload_markdown` tool reads arbitrary files from the server's local filesystem via an unsanitized `file_path` parameter and uploads them to a GitLab project. Combined, any unauthenticated network-reachable attacker can read `/proc/self/environ` to steal the server's `GITLAB_PERSONAL_ACCESS_TOKEN` and achieve full GitLab account takeover. This is the default configuration for Docker deployments. Version 2.1.27 contains a patch.

Related CWEs

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

References (5)

https://github.com/zereight/gitlab-mcp/pull/482

Source: security-advisories@github.com

https://github.com/zereight/gitlab-mcp/pull/554

Source: security-advisories@github.com

https://github.com/zereight/gitlab-mcp/pull/622

Source: security-advisories@github.com

https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-cv3r-c5h8-f4g5

Source: security-advisories@github.com

https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-cv3r-c5h8-f4g5

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

No history available yet.