← back
CVE-2026-3254lowCWE-1021

Improper Restriction of Rendered UI Layers or Frames in GitLab

28Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 3.5epss 0.2%
exploitation probability
0.2%top 95% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Affected products
GitLab · GitLab
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.