PHP file inclusion in Kirby - CVE-2026-44177
Published: May 22, 2026
Vulnerability identifier: #VU132142
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-44177
CWE-ID: CWE-98
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 include arbitrary PHP files.
The vulnerability exists due to improper control of filename for include/require statement in PHP program in the Users collection user lookup when processing a request-provided user ID. A remote attacker can supply a specially crafted user ID to include arbitrary PHP files.
The issue is reachable via unauthenticated requests to the authentication API and also affects other code paths that use $users->find() with request-provided email addresses or user IDs.
How to mitigate CVE-2026-44177
Install security update from vendor's website.