CVE-2026-0752 | THREATINT

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that under certain circumstances, could have allowed an unauthenticated user to inject arbitrary scripts into the Mermaid sandbox UI.

PUBLISHED Reserved 2026-01-08 | Published 2026-02-25 | Updated 2026-02-25 | 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

16.2 (semver) before 18.7.5

affected

18.8 (semver) before 18.8.5

affected

18.9 (semver) before 18.9.1

affected

Credits

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

References

gitlab.com/gitlab-org/gitlab/-/issues/585371 (GitLab Issue #585371) issue-tracking permissions-required

hackerone.com/reports/3473276 (HackerOne Bug Bounty Report #3473276) technical-description exploit permissions-required

about.gitlab.com/...25/patch-release-gitlab-18-9-1-released/

cve.org (CVE-2026-0752)

nvd.nist.gov (CVE-2026-0752)

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