Arbitrary file upload in Balbooa Forms - CVE-2026-56291
Published: July 17, 2026
Vulnerability identifier: #VU138309
CSH Severity: Critical
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-56291
CWE-ID: CWE-434
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to insufficient validation of file extension when uploading files. A remote non-authenticated attacker can upload and execute arbitrary PHP file on the system.
Affected software
Balbooa Forms
How to mitigate CVE-2026-56291
Install update from vendor's website.
Balbooa Forms - update to 2.4.1