`@zereight/mcp-gitlab` is a Model Context Protocol server for GitLab. Versions prior to 2.1.30 expose the Streamable HTTP MCP endpoint without an effective Host or Origin allowlist. A malicious web page can use DNS rebinding to route browser requests to a victim's local MCP listener while preserving an attacker-controlled `Host` and `Origin`.
The server accepts those headers and reaches the MCP initialization path instead of rejecting the request at the HTTP boundary. Version 2.1.30 contains a patch.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://github.com/zereight/gitlab-mcp/commit/52207c6f5c0e7a39e9235d491225edbb5…
security-advisories@github.com
https://github.com/zereight/gitlab-mcp/pull/555
security-advisories@github.com
https://github.com/zereight/gitlab-mcp/releases/tag/v2.1.30
security-advisories@github.com
https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-vmp7-252j-cwp7
security-advisories@github.com