CVE-2026-54002

Description

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.

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Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

CWE-87 CWE-87

References

Other References

https://github.com/getkirby/kirby/commit/0f0437b5128c910103cbc78fc34d94b2a3faef4c https://github.com/getkirby/kirby/commit/7ad76cf9c7387462828e6ebfc8404e31b37829e9 https://github.com/getkirby/kirby/commit/9ec1873864441dbc06479ef7823da348ec7f2700 https://github.com/getkirby/kirby/commit/bb2562e16c754493a403b8df84c9883108871e4c https://github.com/getkirby/kirby/releases/tag/4.9.4 https://github.com/getkirby/kirby/releases/tag/5.4.4 https://github.com/getkirby/kirby/security/advisories/GHSA-wr9h-4r83-f4v6

Frequently Asked Questions

What is CVE-2026-54002? +

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.

How do I check if I'm vulnerable to CVE-2026-54002? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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