XSS in GitLab
CVE-2026-78252
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.3 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that, under certain conditions, an authenticated user could have induced a targeted user to perform unintended state-changing HTTP requests due to improper sanitization of user-controlled data in the Markdown JSON table renderer.
Vulnerability class: XSS (Cross-Site Scripting)
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L.
Affected products
Weakness classification (CWE)
References
- cve@gitlab.com
- cve@gitlab.com (technical-description, permissions-required, exploit)
- cve@gitlab.com
Frequently asked questions
- What is CVE-2026-78252?
- CVE-2026-78252 is a high-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 8.2/10. Published 2026-09-16.
- How severe is CVE-2026-78252?
- High severity. CVSS v3 base score is 8.2 out of 10.