CVE-2026-6335 | THREATINT

Description

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.

PUBLISHED Reserved 2026-04-15 | Published 2026-05-14 | Updated 2026-05-15 | Assigner GitLab

MEDIUM: 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Default status

unaffected

18.11 (semver) before 18.11.3

affected

Credits

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

References

gitlab.com/gitlab-org/gitlab/-/work_items/596760

hackerone.com/reports/3673647 (HackerOne Bug Bounty Report #3673647) technical-description exploit permissions-required

about.gitlab.com/...3/patch-release-gitlab-18-11-3-released/

cve.org (CVE-2026-6335)

nvd.nist.gov (CVE-2026-6335)

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