CVE-2026-3254CWE-1021

Improper Restriction of Rendered UI Layers or Frames in GitLab

Low · published April 22, 2026

CVSS v3.1
3.5
EPSS
0%
Percentile
16.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
3.5 · LOW
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00259 · 16.6th percentile
Weakness
CWE-1021 · Improper Restriction of Rendered UI Layers or Frames
Published
2026-04-22T16:29Z
EPSS history
Timeline
  • 22 APR 16:29Z
    Improper Restriction of Rendered UI Layers or Frames in GitLab
    cvelistv5