# CVE-2026-61560

## Summary

- **CVE ID:** CVE-2026-61560
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-22
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 16, 2026

## 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.

## Affected Products

- zereight — gitlab-mcp (< 2.1.27)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.70%
- **EPSS Percentile:** 51.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._