CVE-2026-44175 Details
Description
Kirby is an open-source content management system. In versions prior to 4.9.1 and 5.4.1, Kirby did not securely sanitize the contents of the list field on save, leaving it vulnerable to cross-site scripting (XSS). Kirby's list field stores its formatted content as HTML, and unlike other field types, its HTML special characters cannot be escaped without losing the formatting. Sanitization was only enforced client-side in the Panel, while the server did not sanitize the content on save. As a result, an attacker could bypass the Panel and send malicious HTML directly to Kirby's API, storing unsanitized markup in the content file. That markup would then be rendered on the site frontend and executed in the browsers of site visitors and logged-in users browsing the site, resulting in persistent XSS. This issue has been fixed in versions 4.9.1 and 5.4.1.
A cross-site scripting (XSS) vulnerability has been identified in Kirby, an open-source content management system, affecting versions prior to 4.9.1 and 5.4.1. The issue arises in the list field, which stores content as HTML. Unlike other field types, HTML special characters in the list field cannot be escaped without losing formatting. This vulnerability allows attackers to inject malicious HTML that is saved unsanitized and executed on the site frontend, impacting visitors and logged-in users.
Users can update to Kirby versions 4.9.1 or 5.4.1 to address this vulnerability. Instructions for updating Kirby can be found in the Kirby documentation.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 16, 2026CISA-ADP
Assessed Jul 17, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/getkirby/kirby/releases/tag/5.4.1 | [email protected] | Release NotesVendor |
| https://github.com/getkirby/kirby/security/advisories/GHSA-5fhx-9q32-q257 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Kirby | <= 4.9.0 (semver) >= 5.0.0, <= 5.4.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 17, 2026 | CVE Modified | CISA-ADP |
| Jul 16, 2026 | New CVE Received | [email protected] |