🔐 CVE Alert

CVE-2026-6335

MEDIUM 5.4

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

CVSS Score
5.4
EPSS Score
0.0%
EPSS Percentile
0th

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 improper sanitization.

CWE CWE-79
Vendor gitlab
Product gitlab
Ecosystems
Industries
Technology
Published May 14, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Affected Versions

GitLab / GitLab
18.11 < 18.11.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗
gitlab.com: https://gitlab.com/gitlab-org/gitlab/-/work_items/596760 hackerone.com: https://hackerone.com/reports/3673647 about.gitlab.com: https://about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-released/

Credits

Thanks [toofikz](https://hackerone.com/toofikz) for reporting this vulnerability through our HackerOne bug bounty program