CVE-2026-21896CWE-863

Kirby is missing permission checks in the content changes API

Medium · published January 8, 2026

CVSS v4.0
5.8
EPSS
0%
Percentile
13.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.8 · MEDIUM
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
EPSS
0.00230 · 13.1th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-01-08T18:09Z
EPSS history
Timeline
  • 08 JAN 18:09Z
    Kirby is missing permission checks in the content changes API
    cvelistv5