Vulnerability · Published Mar 11, 2026 · Assigned by GitLab
CVE-2026-1090Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
High 8.7
In plain English
A high-severity cross-site scripting in GitLab from GitLab. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).
Severity (CVSS 3.1)8.7High
Exploit odds (30 days)0.3%top 80.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
References
- HackerOne Bug Bounty Report #3502450 technical-description, exploit, permissions-required
- https://gitlab.com/gitlab-org/gitlab/-/work_items/586478
- https://about.gitlab.com/releases/2026/03/11/patch-release-gitlab-18-9-2-released/