SB2026081798 - Improper Restriction of Rendered UI Layers or Frames in YouTrack
Published: August 17, 2026
Security Bulletin ID
SB2026081798
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Restriction of Rendered UI Layers or Frames (CVE-ID: CVE-2026-59791)
CWE-ID: CWE-1021 - Improper Restriction of Rendered UI Layers or Frames
CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to inject malicious css.
The vulnerability exists due to improper restriction of rendered ui layers or frames in mermaid diagram rendering when rendering user-supplied mermaid diagrams. A remote user can create a specially crafted diagram to inject malicious css.
Remediation
Install update from vendor's website.