Cross-site scripting in Kirby - CVE-2026-54002
Published: July 20, 2026
Vulnerability identifier: #VU138439
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-54002
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Ian Stewart
Affected software:
Kirby
Kirby
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary JavaScript in the browser context of other users.
The vulnerability exists due to cross-site scripting in Dom::sanitize() when sanitizing untrusted HTML/XML content. A remote user can store malicious markup that survives sanitization to execute arbitrary JavaScript in the browser context of other users.
The issue is a stored XSS condition that can affect Panel sessions and frontend views, and user interaction is limited to a victim viewing the rendered content or served file.
How to mitigate CVE-2026-54002
Install security update from vendor's website.