CVE-2026-29905 Details
Description
Kirby CMS through 5.1.4 allows an authenticated user with 'Editor' permissions to cause a persistent Denial of Service (DoS) via a malformed image upload. The application fails to properly validate the return value of the PHP getimagesize() function. When the system attempts to process this file for metadata or thumbnail generation, it triggers a fatal TypeError.
A persistent denial-of-service vulnerability has been identified in Kirby CMS versions through 5.1.4. The issue allows an authenticated user with 'Editor' permissions to cause a crash by uploading a malformed image file. Kirby CMS processes uploaded images using PHP's getimagesize() function, which can return false for invalid images. However, this return value is not properly validated before the application attempts to generate thumbnails or process metadata, leading to a fatal TypeError. The resulting crash persists across page reloads until the problematic file is manually deleted from the filesystem.
Users can upgrade to Kirby CMS version 5.2.0-rc.1, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 26, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
Affected Products
| Product | Versions |
|---|---|
| getkirby kirby | <= 5.1.4 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 2, 2026 | Initial Analysis | [email protected] |
| Mar 26, 2026 | CVE Modified | CISA-ADP |
| Mar 26, 2026 | New CVE Received | [email protected] |