CVE-2026-1090

high

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.

References

https://about.gitlab.com/releases/2026/03/11/patch-release-gitlab-18-9-2-released/

https://hackerone.com/reports/3502450

https://gitlab.com/gitlab-org/gitlab/-/work_items/586478

Details

Source: Mitre, NVD

Published: 2026-03-11

Updated: 2026-03-11

Risk Information

CVSS v2

Base Score: 8.5

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:N

Severity: High

CVSS v3

Base Score: 8.7

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

Severity: High