Missing Authorization in Kirby - CVE-2026-42174
Published: April 23, 2026
Vulnerability identifier: #VU127192
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42174
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to modify user avatars without authorization.
The vulnerability exists due to missing authorization in user avatar management when handling avatar creation, replacement, or deletion requests. A remote user can create, replace, or delete a user avatar to modify user avatars without authorization.
The issue affects sites where the acting user's role is not permitted to update user information, but file permissions still allow avatar-related actions.
Affected software
Kirby
How to mitigate CVE-2026-42174
Install security update from vendor's website.
Kirby - addressed in versions 4.9.0, 5.4.0