CVE-2025-9222: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-09 · updated 2026-07-15
Weakness: CWE-79

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.2.2 before 18.5.5, 18.6 before 18.6.3, and 18.7 before 18.7.1 that could have allowed an authenticated user to achieve stored cross-site scripting by exploiting GitLab Flavored Markdown.

Affected products

GitLab: from 18.2.2 before 18.5.5; from 18.6.0 before 18.6.3; 18.7.0 — fixed in 18.5.5, 18.6.3

How to fix

Upgrade to a fixed version: GitLab 18.5.5, 18.6.3. Check the vendor advisory for mitigations.

References

https://about.gitlab.com/releases/2026/01/07/patch-release-gitlab-18-7-1-released/
https://gitlab.com/gitlab-org/gitlab/-/issues/562561
https://hackerone.com/reports/3297483
https://access.redhat.com/security/cve/CVE-2025-9222
https://bugzilla.redhat.com/show_bug.cgi?id=2428222
https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-9222.json

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