Authenticated XSS via markdown_placeholders in GitLab CE/EE (v10.618.9.2)
CVE-2026-1090 Published on March 11, 2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 10.6 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user, when the `markdown_placeholders` feature flag was enabled, to inject JavaScript in a browser due to improper sanitization of placeholder content in markdown processing.
Vulnerability Analysis
CVE-2026-1090 is exploitable with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2026-1090 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-1090
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Affected Versions
GitLab:- Version 10.6 and below 18.7.6 is affected.
- Version 18.8 and below 18.8.6 is affected.
- Version 18.9 and below 18.9.2 is affected.