Incorrect Authorization Affecting getkirby/cms package, versions >=5.0.0, <5.2.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PHP-GETKIRBYCMS-14912577
- published11 Jan 2026
- disclosed8 Jan 2026
- creditLukas Kleinschmidt
Introduced: 8 Jan 2026
CVE-2026-21896 (opens in a new tab)How to fix?
Upgrade getkirby/cms to version 5.2.2 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Authorization via the content changes API when permission checks are not properly enforced. An attacker can modify site content by sending unauthorized write requests.
Note: This is only exploitable if user permissions have been configured to restrict specific roles from performing write actions.