Authentication Vulnerability in GitLab MCP Server Exposes Sensitive Operations
CVE-2026-44895

9.2CRITICAL

Key Information:

Vendor

Yoda-digital

Status
Mcp-gitlab-server
Vendor
CVE Published:
26 May 2026

What is CVE-2026-44895?

The GitLab MCP Server prior to version 0.6.0 contains a significant authentication vulnerability, allowing unauthorized AI agents to communicate directly with GitLab. The server's HTTP transport is devoid of any authentication layer, combined with a permissive Access-Control-Allow-Origin header, which opens it to cross-origin attacks. This structural flaw enables the SSE server to create a stateful, mutation-capable RPC endpoint that operates with the operator's personal access token, without requiring any inbound credential checks. Furthermore, the server configuration default binds to all network interfaces, exposing this unprotected functionality broadly. This vulnerability underscores the importance of implementing stringent authentication measures and restricting access to sensitive operations.

Affected Version(s)

mcp-gitlab-server < 0.6.0

References

https://github.com/yoda-digital/mcp-gitlab-server/securit...
x_refsource_CONFIRM

CVSS V4

Score:
9.2
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.