Is CVE-2026-119423 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-119423?

CVE-2026-119423 has a CVSS v3 severity of MEDIUM (5.3).

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CVE-2026-119423

Description

OPNsense core before 26.7.8 contains a log injection vulnerability that allows unauthenticated attackers to plant victim IP addresses in the lockout_handler by submitting crafted WebGUI login usernames. Attackers can submit usernames like 'Invalid user <victim-ip>' repeatedly to add the victim to the sshlockout table, blocking SSH and WebGUI access and killing its pf states.