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Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.11 before 18.9.7, 18.10 before 18.10.6, and 18.11 before 18.11.3 that could have allowed an authenticated user to inject HTML and JavaScript into email notifications sent to other users due to improper input sanitization.

PUBLISHED Reserved 2025-11-03 | Published 2026-05-14 | Updated 2026-05-14 | 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-94: Improper Control of Generation of Code ('Code Injection')

Product status

Default status
unaffected

15.11 (semver) before 18.9.7
affected

18.10 (semver) before 18.10.6
affected

18.11 (semver) before 18.11.3
affected

Credits

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

References

hackerone.com/reports/3368096 (HackerOne Bug Bounty Report #3368096) technical-description exploit permissions-required

gitlab.com/gitlab-org/gitlab/-/work_items/579385

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

cve.org (CVE-2025-12669)

nvd.nist.gov (CVE-2025-12669)

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