What’s Vulnerable › Vulnerabilities

CVE-2026-44195: OPNsense: Authentication lockout bypass

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-13 · updated 2026-10-26
• Weakness: CWE-307

Description

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: before 26.1.7 — fixed in 26.1.7

How to fix

Upgrade to a fixed version: OPNsense 26.1.7. Check the vendor advisory for mitigations.

References

• https://github.com/opnsense/core/security/advisories/GHSA-h3vx-4q27-rc42
• https://gist.github.com/sopex/b9786e72e2a5d9b1bbd81ed8477c351b

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