CVE-2026-29905

PoC —

CVSS 3.1

6.5 medium

EPSS

<1%p38

Published

Mar 26, 2026 (Mar 26, 2026)

Modified

Jun 17, 2026

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.

Vendors: getkirby
Products: kirby
Weakness: CWE-20, CWE-252
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (0.4%)

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