CVE-2026-21896 json
Kirby is missing permission checks in the content changes API
published 10mo ago modified 4mo ago also EUVD-2026-1473 , GHSA-4j78-4xrm-cr2f
- cvss
- 5.7
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 13%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist getkirby/cms 5.2.2
- getkirby kirby 5.2.2
- getkirby panel 5.2.2
Is CVE-2026-21896 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 10mo ago
Exploit prediction
0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.8 | 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 |
| CNA | 4.0 | 5.8 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 5.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | getkirby/cms | >=5.0.0, <5.2.2 |
5.2.2 |
Affected products
- getkirby kirby
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
github.com
/getkirby/kirby/commit/f5ce1347b427b819bf193acf11fd0da232f7af47
web, patch
-
github.com
/getkirby/kirby/security/advisories/GHSA-4j78-4xrm-cr2f
web, patch, vendor-advisory
-
github.com
/getkirby/kirby/releases/tag/5.2.2
web, product, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-21896
advisory
-
github.com
/getkirby/kirby
package
Sources
- CVE List CVE-2026-21896
- GitHub Advisory GHSA-4j78-4xrm-cr2f
- NVD CVE-2026-21896
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.