CVE-2026-119423
mediumOPNsense core before 26.7.8 contains a log injection vulnerability that allows unauthenticated attackers to plant victim IP addresses in the lockout_handler by…
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://abraxaslabs.tech/research/opnsense-lockout-factory-ip disclosure@vulncheck.com
- https://github.com/opnsense/core disclosure@vulncheck.com
- https://github.com/opnsense/core/blob/26.7.7/src/opnsense/mvc/app/library/OPNsense/Auth/Au... disclosure@vulncheck.com
- https://github.com/opnsense/core/blob/26.7.7/src/opnsense/scripts/syslog/lockout_handler#L... disclosure@vulncheck.com
- https://github.com/opnsense/core/commit/14f8f7dd1d5f06522d60794a7beeac7adb9eca68 disclosure@vulncheck.com
- https://github.com/opnsense/core/commit/2076f2c195bf9537ec220f0e5d6aff998f057410 disclosure@vulncheck.com
- https://github.com/opnsense/core/security/advisories/GHSA-2v2x-m4j7-76pv disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/opnsense-core-before-26.7.8-lockout-ip-planting-via-w... disclosure@vulncheck.com