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Vulnerability · Published Jul 9, 2026 · Assigned by GitHub_M

CVE-2026-54002Kirby: Cross-site scripting (XSS) from incomplete HTML/XML sanitization in `Dom::sanitize()`

High 8.5

In plain English

A high-severity cross-site scripting in kirby from getkirby. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.5High
Exploit odds (30 days)0.5%top 54.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Packagistgetkirby/cms4.9.4GHSA-wr9h-4r83-f4v6
Packagistgetkirby/cms5.4.4GHSA-wr9h-4r83-f4v6

Affected products (as reported)

VendorProductVersions
getkirby kirby < 4.9.4>= 5.0.0, < 5.4.4

Weakness: CWE-79, CWE-87 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

References