GitLab Patch Release: 18.10.3, 18.9.5, 18.8.9 | GitLab Docs
GitLab released patch versions 18.10.3, 18.9.5, and 18.8.9 on April 8, 2026, addressing important security and bug fixes. Self-managed CE and EE installations should upgrade immediately, while GitLab.com is already patched and GitLab Dedicated customers need no action. The fixes cover unauthorized access, denial-of-service vulnerabilities, code injection, XSS, and information disclosure. ## Release Scope and Upgrade Guidance - The patches apply to GitLab Community Edition and Enterprise Edition. - Administrators should upgrade installations affected by the listed vulnerabilities to the latest supported patch release. - GitLab issues describing security vulnerabilities will become public 30 days after the release in which they were fixed. - Patch releases are generally issued on the second and fourth Wednesdays, with urgent ad-hoc releases for critical vulnerabilities. ## Authentication and Authorization Fixes - **CVE-2026-5173 (CVSS 8.5):** Authenticated users could invoke unintended server-side methods through WebSocket connections. - **CVE-2026-2619 (CVSS 4.3):** Auditor users could modify vulnerability flag data in private projects through the AI detection API. - **CVE-2026-1752 (CVSS 4.3):** Developers could modify protected environment settings through authorization flaws in the Environments API. - **CVE-2026-2104:** CSV exports could expose confidential issues assigned to other users because of insufficient authorization checks. ## Denial-of-Service Vulnerabilities - **CVE-2026-1092 (CVSS 7.5):** Unauthenticated attackers could crash or disrupt services through malformed JSON sent to the Terraform state lock API. - **CVE-2025-12664 (CVSS 7.5):** Repeated unauthenticated GraphQL queries could cause denial of service. - **CVE-2026-1403 (CVSS 6.5):** Authenticated users could disrupt Sidekiq workers by importing malformed CSV files. - **CVE-2026-1101 (CVSS 6.5):** Authenticated users could overload GitLab through improperly validated GraphQL SBOM queries. ## Code Execution and Cross-Site Scripting - **CVE-2026-1516 (CVSS 5.7):** Crafted Code Quality report content could leak the IP addresses of users viewing the report. - **CVE-2026-4332 (CVSS 5.4):** Authenticated users could execute arbitrary JavaScript in other users’ browsers through customizable analytics dashboards. ## Information Disclosure - **CVE-2025-9484 (CVSS 4.3):** Certain GraphQL queries could reveal other users’ email addresses to authenticated users. - The release also fixes CSV export authorization issues that could expose confidential issue data. Administrators of self-managed GitLab CE or EE instances should apply 18.10.3, 18.9.5, or 18.8.9 as soon as possible, depending on their supported release branch.
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