CVE-2025-1782: Avantfax

Critical severity, CVSS 9.9. EPSS: 0.5% chance of exploitation in the next 30 days.

In HylaFAX Enterprise Web Interface and AvantFAX, the language form element is not properly sanitized before being used and can be misused to include an arbitrary file in the PHP code allowing an attacker to do anything as the web server user. This flaw requires the attacker to be authenticated with a valid user account.

Affected products

• Avantfax Avantfax: before 3.4.1 (fixed in 3.4.1)
• Ifax Hylafax: before 1.2.1 (fixed in 1.2.1); from 1.3.0, before 1.3.2 (fixed in 1.3.2)

Published 2025-04-14. Last modified 2026-08-06.