CVE-2026-44895

CVE-2026-44895 · GitLab MCP Server: SSE transport has no authentication and wildcard CORS, exposing all GitLab tools

This page contains facts from public vulnerability sources. Check the original advisory before updating.

GitLab MCP Server lets an AI agent talk directly to GitLab. Prior to 0.6.0, the HTTP transport in src/transport.ts ships with no authentication layer at all and a wildcard Access-Control-Allow-Origin: * on every response. The structural defect is that the SSE server stands up a stateful, mutation-capable RPC endpoint that is backed by the operator's GITLAB_PERSONAL_ACCESS_TOKEN without any inbound credential check, then advertises itself to every cross-origin browser context via the wildcard CORS header. The httpServer.listen(port) call at line 97 also passes no host argument, so the bind defaults to 0.0.0.0 and exposes the auth-less surface on every interface. This vulnerability is fixed in 0.6.0.

CVSS 9.2 · Critical · EPSS 0.4% · Fix available

Published

2026-05-26T21:08:13.107Z

Updated

2026-05-27T13:35:15.941Z

Stack: node

Check your server →