CVE-2026-44895 GitLab MCP Server: SSE transport has no authentication and wildcard CORS, exposing all GitLab tools
Unauthenticated access to the GitLab MCP Server allows attackers to execute GitLab operations using the operator's token due to missing authentication and wildcard CORS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-44895?
CVE-2026-44895 is a critical missing authorization vulnerability in yoda-digital mcp-gitlab-server, published on 26 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-44895?
2 open source packages ship an affected version, including @yoda.digital/gitlab-mcp-server.
| Package | Affected | Fixed in |
|---|---|---|
@yoda.digital/gitlab-mcp-server npm | All versions | 0.6.0 |
@yoda.digital/gitlab-mcp-server npm | All versions | 0.6.0 |
How do I fix CVE-2026-44895?
Upgrade @yoda.digital/gitlab-mcp-server to 0.6.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-44895 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44895 exists.
Sources
Also known as GHSA-8jr5-6gvj-rfpf.