CVE-2026-3254
Improper Restriction of Rendered UI Layers or Frames in GitLab
- State
- Published
- Severity
- 3.5 Low
- Published
- Apr 22, 2026
- Updated
- Apr 22, 2026
- Reserved
- Feb 26, 2026
Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.1 that under certain conditions could have allowed an authenticated user to load unauthorized content into another user's browser due to improper input validation in the Mermaid sandbox.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 3.5 Low | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N | GitLab |
Weaknesses
- CWE-1021 Improper Restriction of Rendered UI Layers or Frames
Affected Products
| Product | Versions |
|---|---|
GitLabGitLab |
|
References
- HackerOne Bug Bounty Report #3572752technical-descriptionexploitpermissions-required
- https://gitlab.com/gitlab-org/gitlab/-/work_items/591587
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