zereight gitlab-mcp up to 2.1.26 API Call X-GitLab-API-URL redirect

Summaryinfo

A vulnerability labeled as problematic has been found in zereight gitlab-mcp up to 2.1.26. Affected by this vulnerability is an unknown functionality of the component API Call Handler. The manipulation of the argument X-GitLab-API-URL results in redirect. This vulnerability was named CVE-2026-61559. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, was found in zereight gitlab-mcp up to 2.1.26. Affected is an unknown part of the component API Call Handler. The manipulation of the argument X-GitLab-API-URL with an unknown input leads to a redirect vulnerability. CWE is classifying the issue as CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. This is going to have an impact on integrity. CVE summarizes:

`@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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-61559 since 07/10/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1204.001 by the MITRE ATT&CK project.

Upgrading to version 2.1.27 eliminates this vulnerability.

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Productinfo

Type

• Bug Tracking Software

Vendor

• zereight

Name

• gitlab-mcp

Version

• 2.1.0
• 2.1.1
• 2.1.2
• 2.1.3
• 2.1.4
• 2.1.5
• 2.1.6
• 2.1.7
• 2.1.8
• 2.1.9
• 2.1.10
• 2.1.11
• 2.1.12
• 2.1.13
• 2.1.14
• 2.1.15
• 2.1.16
• 2.1.17
• 2.1.18
• 2.1.19
• 2.1.20
• 2.1.21
• 2.1.22
• 2.1.23
• 2.1.24
• 2.1.25
• 2.1.26

Website

• Product: https://github.com/zereight/gitlab-mcp/

CPE 2.3info

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CPE 2.2info

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