CVE-2026-61560

Critical

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.

SeverityCritical

CVSS9.8

Exploit probability—

Product@zereight/mcp-gitlab

PublishedSep 15, 2026

First seenSep 15, 2026

Weakness typeCWE-22Path traversal

How to fix

Update

@zereight/mcp-gitlab2.1.27 or later

Affected products

Product	Affected versions	Fixed in
@zereight/mcp-gitlabnpm	v < 2.1.27	2.1.27

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