zereight gitlab-mcp up to 2.1.26 upload_markdown file_path path traversal

Summaryinfo

A vulnerability classified as critical has been found in zereight gitlab-mcp up to 2.1.26. The impacted element is an unknown function of the component upload_markdown. This manipulation of the argument file_path causes path traversal. This vulnerability is handled as CVE-2026-61560. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in zereight gitlab-mcp up to 2.1.26 and classified as critical. Affected by this vulnerability is some unknown processing of the component upload_markdown. The manipulation of the argument file_path with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

`@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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-61560 since 07/10/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 2.1.27 eliminates this vulnerability.

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Productinfo

Type

• Bug Tracking Software

Vendor

• zereight

Name

• gitlab-mcp

Version

• 2.1.0
• 2.1.1
• 2.1.2
• 2.1.3
• 2.1.4
• 2.1.5
• 2.1.6
• 2.1.7
• 2.1.8
• 2.1.9
• 2.1.10
• 2.1.11
• 2.1.12
• 2.1.13
• 2.1.14
• 2.1.15
• 2.1.16
• 2.1.17
• 2.1.18
• 2.1.19
• 2.1.20
• 2.1.21
• 2.1.22
• 2.1.23
• 2.1.24
• 2.1.25
• 2.1.26

Website

• Product: https://github.com/zereight/gitlab-mcp/

CPE 2.3info

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CPE 2.2info

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