User Avatar Permission Bypass in Kirby CMS
CVE-2026-42174

5.3MEDIUM

Key Information:

Vendor

Getkirby

Status
Kirby
Vendor
CVE Published:
9 May 2026

What is CVE-2026-42174?

Kirby, an open-source content management system, had a significant vulnerability that allowed user avatar creation, replacement, and deletion actions to be performed without adequate user update permissions. This flaw potentially enabled unauthorized users to alter avatars, compromising content control and user integrity. The issue has been addressed in the updated versions 4.9.0 and 5.4.0, necessitating all users to upgrade to these releases for enhanced security.

Affected Version(s)

kirby < 4.9.0 < 4.9.0

kirby >= 5.0.0, < 5.4.0 < 5.0.0, 5.4.0

References

https://github.com/getkirby/kirby/security/advisories/GHS...
x_refsource_CONFIRM
https://github.com/getkirby/kirby/releases/tag/4.9.0
x_refsource_MISC
https://github.com/getkirby/kirby/releases/tag/5.4.0
x_refsource_MISC

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.