Cross-site scripting in Kirby - #VU150658
Published: September 17, 2026
Vulnerability identifier: #VU150658
CSH Severity: Low
CVSS v4: 5.1 [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]
CVE-ID: N/A
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary script in the browsers of Panel users.
The vulnerability exists due to cross-site scripting in Kirby language variables when rendering overwritten translation strings as HTML. A remote user can create or update a language with a malicious variable that overwrites a built-in translation string to execute arbitrary script in the browsers of Panel users.
Exploitation affects multi-language sites and requires a victim to open the Panel in the affected language.
Affected software
Kirby
Remediation
Install security update from vendor's website.
Kirby - addressed in versions 4.9.6, 5.6.0