CVE-2026-54002

HIGH

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

Title source: cna
STIX 2.1

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.

References (7)

Core 7
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/getkirby/kirby/releases/tag/4.9.4
X_Refsource_Misc x_refsource_misc
https://github.com/getkirby/kirby/releases/tag/5.4.4

Scores

CVSS v4 8.5
EPSS 0.0041
EPSS Percentile 33.7%
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:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-79 CWE-87
Status published
Products (2)
getkirby/kirby < 4.9.4
getkirby/kirby >= 5.0.0, < 5.4.4
Published Jul 09, 2026
Tracked Since Jul 10, 2026