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CVE-2026-21896

5.7 · MEDIUM

Kirby is an open-source content management system.

Published Jan 8, 2026CWE-863EPSS 0.23%

Overview

CVE-2026-21896 is a medium-severity vulnerability. It was published on January 8, 2026 and has a CVSS 3.1 base score of 5.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.7, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/getkirby/kirby/commit/f5ce1347b427b819bf193acf11fd0da232f7af47GitHubgithub.com/getkirby/kirby/releases/tag/5.2.2GitHubgithub.com/getkirby/kirby/security/advisories/GHSA-4j78-4xrm-cr2f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-21896?

CVE-2026-21896 is a medium-severity vulnerability. It was published on January 8, 2026 and has a CVSS 3.1 base score of 5.7 (MEDIUM).

How severe is CVE-2026-21896?

This vulnerability has a CVSS 3.1 base score of 5.7, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-21896?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-21896?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-21896 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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