CVE-2026-21896

MEDIUM

5.7

Description

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.

CVE Details

CVSS v3.1 Score5.7

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionREQUIRED

Published1/8/2026

Last Modified2/2/2026

Sourcenvd

Honeypot Sightings0

Affected Products

getkirby:kirby

Weaknesses (CWE)

CWE-863

References

https://github.com/getkirby/kirby/commit/f5ce1347b427b819bf193acf11fd0da232f7af47(security-advisories@github.com)

https://github.com/getkirby/kirby/releases/tag/5.2.2(security-advisories@github.com)

https://github.com/getkirby/kirby/security/advisories/GHSA-4j78-4xrm-cr2f(security-advisories@github.com)

IOC Correlations

No correlations recorded

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