Path traversal in Kirby - #VU150668
Published: September 17, 2026
Vulnerability identifier: #VU150668
CSH Severity: Low
CVSS v4: 7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to write account files to arbitrary writable directories.
The vulnerability exists due to improper limitation of a pathname to a restricted directory in Kirby user creation when creating a user with a crafted ID. A remote privileged user can supply a crafted user ID to write account files outside the accounts directory.
The written filenames are index.php and .htpasswd.
Affected software
Kirby
Remediation
Install security update from vendor's website.
Kirby - addressed in versions 4.9.6, 5.6.0