Arbitrary Code Execution Vulnerability in GitLab CE/EE
CVE-2026-6335

5.4MEDIUM

Key Information:

Vendor

Gitlab
Status
Gitlab
Vendor
CVE Published:
14 May 2026

What is CVE-2026-6335?

A security issue in GitLab CE/EE allows an authenticated user to execute arbitrary code in another user's browser session due to improper sanitization of input. This vulnerability affects all versions from 18.11 prior to 18.11.3 and poses a risk of unauthorized actions being carried out on behalf of other users, potentially leading to data exposure or further exploitation within the application context.

Affected Version(s)

GitLab 18.11 < 18.11.3

References

https://gitlab.com/gitlab-org/gitlab/-/work_items/596760
https://hackerone.com/reports/3673647
technical-descriptionexploitpermissions-required
https://about.gitlab.com/releases/2026/05/13/patch-releas...

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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