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CVE-2026-54002Kirby: Cross-site scripting (XSS) from incomplete HTML/XML sanitization in `Dom::sanitize()`
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 HIGHEPSS 0.54%Not in KEVNVD: Deferred
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 8.5 | HIGH | 4.0GitHub_M (CNA) | 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 |
Details
- CVE ID
- CVE-2026-54002
- Status
- Deferred
- Assigner (CNA)
- GitHub_M
- Published
- Jul 9, 2026
- Last modified
- 2026-10-25 17:10 UTC
Affected Products
As published by the CNA in the CVE record.
getkirbykirby2 version ranges
- < 4.9.4
- >= 5.0.0, < 5.4.4
References
- github.com https://github.com/getkirby/kirby/commit/0f0437b5128c910103cbc78fc34d94b2a3faef4c
- github.com https://github.com/getkirby/kirby/commit/7ad76cf9c7387462828e6ebfc8404e31b37829e9
- github.com https://github.com/getkirby/kirby/commit/9ec1873864441dbc06479ef7823da348ec7f2700
- github.com https://github.com/getkirby/kirby/commit/bb2562e16c754493a403b8df84c9883108871e4c
- github.com https://github.com/getkirby/kirby/releases/tag/4.9.4
- github.com https://github.com/getkirby/kirby/releases/tag/5.4.4
- github.com https://github.com/getkirby/kirby/security/advisories/GHSA-wr9h-4r83-f4v6