@zereight/mcp-gitlab Vulnerable to Server-Side Request Forgery

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-61559
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-15 21:16:41 UTC
Updated2026-09-30 17:51:56 UTC
Description`@zereight/mcp-gitlab` is a Model Context Protocol server for GitLab. Starting in version 0.0.1 and prior to version 2.1.27, when the environment variable `ENABLE_DYNAMIC_API_URL=true` is set, the server reads the `X-GitLab-API-URL` HTTP request header and uses it as the base URL for all outbound GitLab API calls made within that request. The server validates that the value is a well-formed URL (`new URL(dynamicApiUrl)`) but applies no allowlist or hostname restriction. The server then attaches the victim's `Private-Token` to every outbound fetch that uses the redirected URL. Any caller who can reach the HTTP transport can set `X-GitLab-API-URL` to an attacker-controlled host. The next GitLab API call the server makes delivers the victim's token to that host. Version 2.1.27 contains a patch.

Risk And Classification

Primary CVSS: v3.1 9.6 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

EPSS: 0.004260000 probability, percentile 0.345730000 (date 2026-10-01)

Problem Types: CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
3.1CNADECLARED9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Zereight Gitlab-mcp affected >= 0.0.1, < 2.1.27 Not specified

References

ReferenceSourceLinkTags
github.com/zereight/gitlab-mcp/commit/6ffb4cc70706fd05b1ab80901676bc2998... [email protected] github.com
github.com/zereight/gitlab-mcp/releases/tag/v2.1.27 [email protected] github.com
github.com/zereight/gitlab-mcp/pull/625 [email protected] github.com
github.com/zereight/gitlab-mcp/security/advisories/GHSA-2h44-8472-frjj 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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