CVE-2025-13781 Overview
GitLab has patched a missing authorization vulnerability in GitLab Enterprise Edition (EE) that allowed authenticated users to modify instance-wide AI feature provider settings. The flaw resides in GraphQL mutations that failed to enforce proper authorization checks. An authenticated attacker with low privileges could alter configuration reserved for administrators, affecting the integrity of AI provider settings across the entire instance. The issue affects GitLab EE versions 18.5 before 18.5.5, 18.6 before 18.6.3, and 18.7 before 18.7.1. GitLab addressed the vulnerability in patch release 18.7.1 following coordinated disclosure through HackerOne. The weakness is tracked under [CWE-862] Missing Authorization.
Critical Impact
Authenticated non-admin users can tamper with instance-wide AI feature provider configuration, undermining the integrity of AI-driven functionality across the GitLab instance.
Affected Products
- GitLab EE versions 18.5 through 18.5.4
- GitLab EE versions 18.6 through 18.6.2
- GitLab EE version 18.7.0
Discovery Timeline
- 2026-01-07 - GitLab releases patch 18.7.1 addressing the issue
- 2026-01-09 - CVE-2025-13781 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-13781
Vulnerability Analysis
The vulnerability is a Missing Authorization flaw in GraphQL mutations that manage AI feature provider settings in GitLab EE. GraphQL mutation resolvers responsible for updating instance-wide AI configuration did not verify whether the calling user held administrative privileges. As a result, any authenticated GitLab user could invoke the mutations and change settings intended to be restricted to instance administrators.
Successful exploitation impacts the integrity of AI provider configuration but does not directly disclose confidential data or disrupt service availability. Because AI provider settings influence how AI-driven features route requests and process content, tampering can degrade trust in AI-assisted workflows across projects and groups on the instance.
Root Cause
The root cause is a missing authorization check on GraphQL mutation resolvers handling AI feature provider settings [CWE-862]. GitLab's policy layer, which normally validates administrator scope for instance-wide configuration, was not applied to these specific mutations. Access control decisions relied on authentication alone rather than authorization against the required role.
Attack Vector
Exploitation requires network access to the GitLab GraphQL endpoint and a valid authenticated session with any role. The attacker sends a crafted GraphQL mutation targeting the AI feature provider settings. No user interaction is required, and the attack complexity is low. Refer to the HackerOne Security Report and the GitLab Issue Discussion for technical details.
Detect Identity Attacks the Moment Authentication Fails
Singularity™ Identity surfaces credential misuse, lateral movement, and privilege escalation in real time, so you can contain the breach before it spreads.
Stop Identity AttacksDetection Methods for CVE-2025-13781
Indicators of Compromise
- Unexpected GraphQL mutation calls targeting AI feature provider settings from non-administrator accounts.
- Audit log entries showing changes to instance-wide AI configuration performed by users without the administrator role.
- Sudden changes in AI provider endpoints, API keys, or model routing configuration outside of change-management windows.
Detection Strategies
- Enable and review GitLab audit events for instance-wide setting changes, correlating actor role with the modified resource.
- Inspect GitLab production logs and GraphQL logs for mutation names related to AI feature settings and flag calls originating from non-admin users.
- Baseline normal administrative activity, and alert on deviations in the source IP or account performing AI provider updates.
Monitoring Recommendations
- Forward GitLab audit and application logs to a centralized SIEM for correlation with authentication and role data.
- Alert on any HTTP POST to /api/graphql containing AI provider mutation fields when the session role is below administrator.
- Periodically export and diff AI feature provider settings to detect unauthorized changes between reviews.
How to Mitigate CVE-2025-13781
Immediate Actions Required
- Upgrade GitLab EE to 18.5.5, 18.6.3, or 18.7.1 depending on your deployed branch.
- Audit current AI feature provider settings and revert any unauthorized modifications.
- Review audit logs since deployment of the affected versions for evidence of tampering by non-administrator accounts.
Patch Information
GitLab remediated the vulnerability in patch releases 18.5.5, 18.6.3, and 18.7.1. Details are available in the GitLab Release Patch Announcement. Administrators should apply the corresponding patch for their release branch and validate the upgrade in a staging environment before production rollout.
Workarounds
- No official workaround is published; upgrading to a fixed version is the recommended remediation.
- Restrict network access to the GitLab GraphQL endpoint using reverse proxy rules where feasible until patching is complete.
- Reduce the number of authenticated users on the instance and enforce least privilege while planning the upgrade.
# Verify the running GitLab version after upgrade
sudo gitlab-rake gitlab:env:info | grep -i "GitLab information" -A 5
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
