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High, CVSS 8.1amended

@zereight/mcp-gitlab has multiple safety-control bypasses: execute_graphql read-only + allow-list bypass, unauthenticated transports, session-exhaustion DoS

GHSA-5648-rgj9-v224

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@zereight/mcp-gitlab 2.1.30), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.1 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Summary @zereight/mcp-gitlab exposes GitLab to an LLM agent while relying on read-only mode, a project allow-list, and transport auth as its safety controls. Five defects defeat those controls. Under the MCP threat model, tool-call arguments/content can be shaped by untrusted input (prompt injection) or a malicious client. Reviewed commit: 60adcc0de5b0e96c4c2029f7a25d2775946421d8 (package version 2.1.28). Source review only; PoCs are local/offline. - F1 (HIGH) executegraphql defeats BOTH read-only mode and GITLABALLOWEDPROJECTIDS. - F2 (HIGH, deployment-conditional) Streamable HTTP /mcp unauthenticated under cookie-jar / device-flow credentials. - F3 (MEDIUM) SSE unauthenticated by default, no Origin/Host validation (DNS rebinding). - F4 (HIGH) unauthenticated session/transport-exhaustion DoS (token check is syntactic only). - F5 (LOW) CI job trace returned verbatim (prompt-injection surface). Details F1 — index.ts:9194-9245 (case "executegraphql"), guard at :9196, detector in…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-5648-rgj9-v224

  2. Revision 2 · amended ·

    Amended from osv record GHSA-5648-rgj9-v224

  3. Revision 1 · created ·

    Published from ghsa record GHSA-5648-rgj9-v224

Agent brief

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# Patch Next advisory brief: GHSA-5648-rgj9-v224

Advisory: @zereight/mcp-gitlab has multiple safety-control bypasses: execute_graphql read-only + allow-list bypass, unauthenticated transports, session-exhaustion DoS
IDs: GHSA-5648-rgj9-v224
Record: https://patchnext.com/advisories/ghsa-5648-rgj9-v224 (revision 3, source checked 26 Oct 2026, 13:02 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @zereight/mcp-gitlab 2.1.30. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @zereight/mcp-gitlab: affected < 2.1.30; fixed in 2.1.30

## Suggested inspection (read-only)
- `npm ls @zereight/mcp-gitlab --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @zereight/mcp-gitlab.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-5648-rgj9-v224 (GitHub-reviewed advisory GHSA-5648-rgj9-v224 lists affected ranges: npm @zereight/mcp-gitlab >=0 <2.1.30)
- Verified: https://osv.dev/vulnerability/GHSA-5648-rgj9-v224 (OSV record GHSA-5648-rgj9-v224 lists affected ranges: npm @zereight/mcp-gitlab >=0 <2.1.30 (fixed))

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