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EUVD-2026-371258

fkie_cve-2026-61559

`@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.

GHSA-2h44-8472-frjj — @zereight/mcp-gitlab Vulnerable to Server-Side Request Forgery

Affected: npm: @zereight/mcp-gitlab

# Server-Side Request Forgery via X-GitLab-API-URL Header Allows Credential Theft

## Affected

- **Repository:** `zereight/gitlab-mcp` - **Affected versions:** All versions through commit `74a8c83` - **Patched versions:** None at time of report

## Severity

High. CVSS v3.1 8.5 (`AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N`)

## Description

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.

The vulnerable code appears at two locations.

**SSE handler (`index.ts:11541`):**

```typescript const dynamicApiUrl = req.headers["x-gitlab-api-url"]?.trim(); if (ENABLE_DYNAMIC_API_URL && dynamicApiUrl) { apiUrl = normalizeGitLabApiUrl(dynamicApiUrl); // no allowlist check } ```

**Streamable HTTP handler (`index.ts:11787`), inside `parseAuthHeaders`:**

```typescript const dynamicApiUrl = req.headers["x-gitlab-api-url"]?.trim(); if (ENABLE_DYNAMIC_API_URL && dynamicApiUrl) { new URL(dynamicApiUrl);…