Improper Restriction of Rendered UI Layers or Frames in HedgeDoc - #VU165819
Published: November 11, 2026
Vulnerability identifier: #VU165819
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-1021
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to display deceptive, interactive third-party content within a trusted HedgeDoc presentation URL for phishing or user-interface spoofing.
The vulnerability exists due to improper restriction of rendered frames in HedgeDoc's slide presentation rendering when reveal.js dynamically creates background iframes without the sandbox and credentialless attributes. A remote user can author a presentation using data-background-iframe and data-background-interactive attributes and share its link with viewers to display attacker-controlled interactive content within the presentation.
Affected software
HedgeDoc
Remediation
Install security update from vendor's website.
HedgeDoc - update to 1.12.1