getkirby Kirby up to 4.9.3/5.4.3 List sanitizeFile/sanitizeContents cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, was found in getkirby Kirby up to 4.9.3/5.4.3. This affects the function Dom::sanitize/Sane::sanitize/Sane::Html::sanitize/Sane::Svg::sanitize/Sane::Xml::sanitize/Sane::sanitizeFile/sanitizeContents of the component List. Executing a manipulation can lead to cross site scripting. This vulnerability is tracked as CVE-2026-54002. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in getkirby Kirby up to 4.9.3/5.4.3 and classified as problematic. This vulnerability affects the function Dom::sanitize/Sane::sanitize/Sane::Html::sanitize/Sane::Svg::sanitize/Sane::Xml::sanitize/Sane::sanitizeFile/sanitizeContents of the component List. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

Kirby is an open-source content management system. Prior to 4.9.4 and 5.4.4, Kirby sites and plugins that use the writer or list fields or call Dom::sanitize(), Sane::sanitize(), Sane::Html::sanitize(), Sane::Svg::sanitize(), Sane::Xml::sanitize(), Sane::sanitizeFile(), or file sanitizeContents() with untrusted input allow malicious markup injected as children of an unknown HTML or XML tag to pass through Dom::sanitize() without being correctly sanitized, causing stored cross-site scripting. This issue is fixed in versions 4.9.4 and 5.4.4.

The advisory is available at github.com. This vulnerability was named CVE-2026-54002 since 06/11/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 4.9.4 or 5.4.4 eliminates this vulnerability.

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Productinfo

Vendor

• getkirby

Name

• Kirby

Version

• 4.9.0
• 4.9.1
• 4.9.2
• 4.9.3
• 5.4.0
• 5.4.1
• 5.4.2
• 5.4.3

Website

• Product: https://github.com/getkirby/kirby/

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