CVE-2026-44195: Opnsense

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.7, a logic flaw in the OPNsense lockout_handler allows an unauthenticated attacker to continuously reset the authentication failure counter for their IP address. By interjecting a crafted username containing a success keyword ("Accepted" or "Successful login") between normal brute-force attempts, an attacker can prevent the failure counter from ever reaching the lockout threshold. This vulnerability is fixed in 26.1.7.

Affected products

• Opnsense Opnsense: before 26.1.7 (fixed in 26.1.7)

Published 2026-05-13. Last modified 2026-06-17.