Medium severity5.3NVD Advisory· Published Oct 30, 2026
CVE-2026-119423
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 ' repeatedly to add the victim to the sshlockout table, blocking SSH and WebGUI access and killing its pf states.
Affected products
1Patches
Vulnerability mechanics
References
7- abraxaslabs.tech/research/opnsense-lockout-factory-ipnvd
- github.com/opnsense/core/blob/26.7.7/src/opnsense/mvc/app/library/OPNsense/Auth/AuthenticationFactory.phpnvd
- github.com/opnsense/core/blob/26.7.7/src/opnsense/scripts/syslog/lockout_handlernvd
- github.com/opnsense/core/commit/14f8f7dd1d5f06522d60794a7beeac7adb9eca68nvd
- github.com/opnsense/core/commit/2076f2c195bf9537ec220f0e5d6aff998f057410nvd
- github.com/opnsense/core/security/advisories/GHSA-2v2x-m4j7-76pvnvd
- www.vulncheck.com/advisories/opnsense-core-before-26.7.8-lockout-ip-planting-via-webgui-login-usernamenvd
News mentions
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