CVE-2026-61560

CRITICAL 9.8

@zereight/mcp-gitlab's unauthenticated arbitrary file read via `upload_markdown` enables PAT exfiltration and full account takeover

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

`@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.

CWE	CWE-22
Vendor	zereight
Product	gitlab-mcp
Published	Sep 15, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

zereight / gitlab-mcp

< 2.1.27

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-cv3r-c5h8-f4g5 github.com: https://github.com/zereight/gitlab-mcp/pull/482 github.com: https://github.com/zereight/gitlab-mcp/pull/554 github.com: https://github.com/zereight/gitlab-mcp/pull/622