CVE-2026-3254
Improper Restriction of Rendered UI Layers or Frames in GitLab
3.5
LOW
CVSS 3.1
EPSS 0.01%
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.
How to fix CVE-2026-3254
To remediate CVE-2026-3254, upgrade the affected package to a fixed version below.
- —upgrade to 18.11.1 or later
Is CVE-2026-3254 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 18.11.0, < 18.11.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW3.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N |