Improper Check for Unusual or Exceptional Conditions Affecting getkirby/cms package, versions <5.2.0-rc.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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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Test your applications- Snyk IDSNYK-PHP-GETKIRBYCMS-15798277
- published28 Mar 2026
- disclosed27 Mar 2026
- creditStalin-143
Introduced: 27 Mar 2026
NewCVE-2026-29905 (opens in a new tab)How to fix?
Upgrade getkirby/cms to version 5.2.0-rc.1 or higher.
Overview
Affected versions of this package are vulnerable to Improper Check for Unusual or Exceptional Conditions in the image upload process due to improper validation of the return value from the getimagesize function. An attacker can cause persistent application crashes and denial of service by uploading a malformed file with a valid image extension, which triggers a fatal error when accessed. This is only exploitable if the attacker is an authenticated user with Editor permissions.