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Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.11 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have, under certain circumstances, allowed an unauthenticated user to perform unauthorized actions on behalf of another user by injecting malicious external scripts into the Swagger UI."

PUBLISHED Reserved 2025-10-21 | Published 2025-12-11 | Updated 2025-12-12 | Assigner GitLab




HIGH: 8.0CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

Problem types

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

Product status

Default status
unaffected

15.11 (semver) before 18.4.6
affected

18.5 (semver) before 18.5.4
affected

18.6 (semver) before 18.6.2
affected

Credits

Thanks [x0abcd_](https://hackerone.com/x0abcd_) for reporting this vulnerability through our HackerOne bug bounty program finder

References

gitlab.com/gitlab-org/gitlab/-/issues/577975 (GitLab Issue #577975) issue-tracking permissions-required

hackerone.com/reports/3317485 (HackerOne Bug Bounty Report #3317485) technical-description exploit permissions-required

about.gitlab.com/...10/patch-release-gitlab-18-6-2-released/

cve.org (CVE-2025-12029)

nvd.nist.gov (CVE-2025-12029)

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