VulnerabilityAnalyzed

CVE-2026-29905

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.

MEDIUM 6.5EPSS 0.45%

Does this matter?

Lower severity and a low EPSS score (0.45%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.45% probability · 38th percentile
CISA KEV: Not listed
Weakness: CWE-20, CWE-252
Affected: getkirby/kirby
Source: cve@mitre.org

References

https://drive.google.com/file/d/1MwvvSYIwnC8kOIzjycGMQZw4d2K2ef8h/view?usp=sharingExploit
https://github.com/Stalin-143/CVE-2026-29905Third Party Advisory
https://github.com/getkirby/kirby/releases/tag/5.2.0-rc.1Product

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.