Arbitrary file upload in FacturaScripts - CVE-2026-42879
Published: November 9, 2026
Vulnerability identifier: #VU163103
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42879
CWE-ID: CWE-434
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an authenticated remote attacker to upload executable PHP files through FacturaScripts' product image upload functionality.
The vulnerability exists due to MIME validation that accepts PHP files prefixed with a GIF header while preserving executable extensions in a web-accessible upload directory. An authenticated remote attacker can submit a disguised PHP file and request its stored URL to execute commands when the server is configured to execute PHP in that directory.
Affected software
FacturaScripts
How to mitigate CVE-2026-42879
Install security update from vendor's website.
FacturaScripts - update to 2026.1