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critical·Misconfiguration·Updated Sep 28, 2026

GitLab MCP Server < 2.1.27 - Unauthenticated SSE Transport Access

Est. Time~10 seconds
Scan TypeGroup Scan
Targetsdomain, subdomain, ipv4
CostFree
0
Times Used
continuous scan runs
10
Continuously Checked
assets under CS
0
Vulnerabilities Found
confirmed findings
References
9.8
CVSScritical
Exploitable remotely over the internet · no authentication required.
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.

Attack Vector
Network
Privileges Req.
None
User Interaction
None
Affected
gitlab-mcpby zereight
< 2.1.27
Updated Nov 10, 2026View on NVD →

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