Path traversal in Kirby - #VU138447
Published: July 20, 2026
Vulnerability identifier: #VU138447
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Ian Stewart
Affected software:
Kirby
Kirby
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to path traversal in the media handler when processing requests for ungenerated media thumbnails. A remote attacker can send a specially crafted request to disclose sensitive information.
Exploitation is possible only when the site index root is adjacent to a PHP-readable sibling directory sharing the same name prefix, and the targeted media file has a prepared thumbnail job file.
Remediation
Install security update from vendor's website.