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**Name of the Vulnerable Software and Affected Versions** GitLab EE versions 16.4 through 18.11.5 GitLab EE versions 19.0 through 19.0.2 GitLab EE versions 19.1 through 19.1.0 **Description** Improper sanitization of user-supplied input allows an authenticated user with developer-role permissions to execute arbitrary client-side code within the session context of another user. This is a Cross-site Scripting (XSS) issue, which occurs when an application includes untrusted data in a web page without proper validation or encoding. **Recommendations** Update to version 18.11.6 or later. Update to version 19.0.3 or later. Update to version 19.1.1 or later.

**Name of the Vulnerable Software and Affected Versions** GitLab CE/EE versions 10.6 through 18.7.5 GitLab CE/EE versions 18.8 through 18.8.5 GitLab CE/EE versions 18.9 through 18.9.1 **Description** GitLab CE/EE is affected by an issue that could allow an authenticated user to inject JavaScript into a browser. This occurs when the `markdown placeholders` feature flag is enabled due to improper sanitization of placeholder content during markdown processing. The issue affects versions from 10.6 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2. The vulnerability allows for the injection of JavaScript through the processing of markdown content. The vulnerable component is related to the handling of placeholder content within markdown. **Recommendations** GitLab CE/EE versions 10.6 through 18.7.5 should be updated to version 18.7.6 or later. GitLab CE/EE versions 18.8 through 18.8.5 should be updated to version 18.8.6 or later. GitLab CE/EE versions 18.9 through 18.9.1 should be updated to version 18.9.2 or later.