CVE-2026-1090

HIGH severity · CVSS 8.7 · Cross-site scripting (XSS)

8.7CVSS HIGH

Summary

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.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionRequired

Confidentiality impactHigh

Integrity impactHigh

Availability impactNone

Exploit probability (EPSS)0%

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Affected products we track (1)

GitLab

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Additional information

NVD record
https://about.gitlab.com/releases/2026/03/11/patch-release-gitlab-18-9-2-released/Advisory
https://gitlab.com/gitlab-org/gitlab/-/work_items/586478
https://hackerone.com/reports/3502450