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Vulnerability record · CVE-2026-54002 · published 9 July 2026

CVE-2026-54002: Cross-site scripting vulnerability

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.

8.5 CVSS 4.0 High EPSS 0.55% · top 56.5% CWE-79 · Cross-site scriptingCWE-87 · CWE-87 Deferred
8.5CVSS 4.0 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
10 Jul 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-54002), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.