CVE-2026-1090

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

State: Published
Severity: 8.7 High
Published: Mar 11, 2026
Updated: Mar 12, 2026
Reserved: Jan 16, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.7 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N	GitLab

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
GitLabGitLab	10.6 to before 18.7.6Affected 18.8 to before 18.8.6Affected 18.9 to before 18.9.2Affected

References

HackerOne Bug Bounty Report #3502450technical-descriptionexploitpermissions-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/

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