What is CVE-2026-6335?

CVE-2026-6335 is a medium-severity vulnerability in Gitlab, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-14.

How severe is CVE-2026-6335?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Gitlab

CVE-2026-6335

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.3 that under certain conditions could have allowed an authenticated user to execute arbitrary code in another user's browser session due to impro…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (9.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Gitlab — versions 18.11

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cve@gitlab.com (Broken Link)
cve@gitlab.com (Permissions Required, technical-description, permissions-required, exploit)
cve@gitlab.com (Release Notes)

Frequently asked questions

What is CVE-2026-6335?: CVE-2026-6335 is a medium-severity vulnerability in Gitlab, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-14.
How severe is CVE-2026-6335?: Medium severity. CVSS v3 base score is 5.4 out of 10.