CVE-2026-21896 MEDIUM

CVE-2026-21896: Kirby is missing permission checks in the content changes API

Vendor Getkirby
Product kirby
Weakness CWE-863 · Incorrect authorization
Published January 8, 2026
Last update January 8, 2026

CVSS base score

5.8/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N

What the vulnerability does

01Description

Kirby is an open-source content management system. From versions 5.0.0 to 5.2.1, Kirby is missing permission checks in the content changes API. This vulnerability affects all Kirby sites where user permissions are configured to prevent specific role(s) from performing write actions, specifically by disabling the update permission with the intent to prevent modifications to site content. This vulnerability does not affect those who have not altered the deviated from default user permissions. This issue has been patched in version 5.2.2.

Key dates

02Disclosure timeline

January 8, 2026 CVE published
January 8, 2026 Record updated