Improper Neutralization of Alternate XSS Syntax in Kirby - #VU150664
Published: September 17, 2026
Vulnerability identifier: #VU150664
CSH Severity: Low
CVSS v4: 8.4 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-87
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary script.
The vulnerability exists due to improper neutralization of alternate cross-site scripting syntax in Dom::sanitize() when sanitizing SVG or XML content for inline embedding. A remote user can submit crafted SVG or XML content for inline rendering to execute arbitrary script.
The rendered page must be viewed by another user.
Affected software
Kirby
Remediation
Install security update from vendor's website.
Kirby - addressed in versions 4.9.6, 5.6.0