Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Getkirby | Kirby | >= 5.0.0, < 5.2.2 |
Related Weaknesses (CWE)
References
- https://github.com/getkirby/kirby/commit/f5ce1347b427b819bf193acf11fd0da232f7af4Patch
- https://github.com/getkirby/kirby/releases/tag/5.2.2ProductRelease Notes
- https://github.com/getkirby/kirby/security/advisories/GHSA-4j78-4xrm-cr2fPatchVendor Advisory
FAQ
What is CVE-2026-21896?
CVE-2026-21896 is a vulnerability with a CVSS score of 5.7 (MEDIUM). 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 pe...
How severe is CVE-2026-21896?
CVE-2026-21896 has been rated MEDIUM with a CVSS base score of 5.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-21896?
Check the references section above for vendor advisories and patch information. Affected products include: Getkirby Kirby.