GitLab Patches CSRF and WebSocket Access Control Flaws in CE/EE
GitLab disclosed and remediated two high-severity vulnerabilities in GitLab CE/EE that could expose sensitive data and enable unauthorized actions. CVE-2026-3857 is a CWE-352 cross-site request forgery flaw in GitLab GraphQL functionality caused by insufficient CSRF protection, allowing an unauthenticated attacker to trigger arbitrary GraphQL mutations on behalf of an authenticated user if that user can be induced to interact. The issue affects versions from 17.10 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1.
GitLab also fixed CVE-2026-5173, a CWE-749 improper access control issue that lets an authenticated user invoke unintended server-side methods over websocket connections. That flaw affects versions from 16.9.6 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3, with GitLab rating it as network-exploitable with low attack complexity and significant confidentiality impact. GitLab published patch release information and related work items for both vulnerabilities, urging customers to update affected self-managed deployments to the fixed releases.
Timeline
Apr 8, 2026
GitLab discloses and remediates CVE-2026-5173 websocket access flaw
On April 8, 2026, GitLab disclosed CVE-2026-5173, an improper access control issue in GitLab CE/EE that could allow an authenticated user to invoke unintended server-side methods through websocket connections. GitLab reported the flaw affected versions from 16.9.6 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3, and released patch information alongside an associated work item.
Mar 25, 2026
GitLab discloses and patches CVE-2026-3857 CSRF flaw
On March 25, 2026, GitLab disclosed CVE-2026-3857, a CSRF vulnerability in GitLab CE/EE GraphQL functionality that could let an unauthenticated attacker trigger arbitrary GraphQL mutations on behalf of authenticated users. GitLab said the issue affected versions from 17.10 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1, and published remediation references including a patch release announcement, work item, and HackerOne report.
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