Inclusion of Functionality from Untrusted Control Sphere in Kirby - #VU150663
Published: September 17, 2026
Vulnerability identifier: #VU150663
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-829
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose limited sensitive information and alter rendered content.
The vulnerability exists due to incomplete URL detection in SaneSvg and SaneSvgz CSS @import rule handling when processing uploaded SVG or SVGZ files. A remote user can upload a crafted SVG that references an external stylesheet to disclose limited sensitive information and alter rendered content.
The stylesheet is loaded only when the SVG is rendered as a document, including direct media URL access, object or iframe embedding, or inlined SVG content.
Affected software
Kirby
Remediation
Install security update from vendor's website.
Kirby - addressed in versions 4.9.6, 5.6.0