{"id":"CVE-2026-119423","title":"OPNsense core before 26.7.8 Lockout IP Planting via WebGUI Login Username","summary":"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 lik…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cvssSource":"cna","cwe":["CWE-117"],"vendor":"opnsense","product":"core","affected":["core < 26.7.8"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-11-04T15:05:24.381582Z"},"published":"2026-10-30","updated":"2026-11-04","sourceUpdated":"2026-11-04T15:05:35.901Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-119423","references":[{"url":"https://github.com/opnsense/core/commit/14f8f7dd1d5f06522d60794a7beeac7adb9eca68"},{"url":"https://github.com/opnsense/core/commit/2076f2c195bf9537ec220f0e5d6aff998f057410"},{"url":"https://github.com/opnsense/core/blob/26.7.7/src/opnsense/mvc/app/library/OPNsense/Auth/AuthenticationFactory.php#L232"},{"url":"https://github.com/opnsense/core/blob/26.7.7/src/opnsense/scripts/syslog/lockout_handler#L70"},{"url":"https://github.com/opnsense/core/security/advisories/GHSA-2v2x-m4j7-76pv","label":"GitHub Security Advisory (GHSA-2v2x-m4j7-76pv)"},{"url":"https://abraxaslabs.tech/research/opnsense-lockout-factory-ip"},{"url":"https://github.com/opnsense/core"},{"url":"https://www.vulncheck.com/advisories/opnsense-core-before-26.7.8-lockout-ip-planting-via-webgui-login-username","label":"VulnCheck Advisory: OPNsense core before 26.7.8 Lockout IP Planting via WebGUI Login Username"}],"tags":["cve.org"],"epss":0.00376,"epssPercentile":0.31724,"ingestedAt":"2026-11-03T10:42:03.641Z","slug":"CVE-2026-119423","body":"## Overview\n\nOPNsense 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.\n\n## Affected\n\n- `core < 26.7.8`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}