{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-119423", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-10-30T02:41:13.241Z", "datePublished": "2026-10-30T11:30:53.650Z", "dateUpdated": "2026-10-30T11:30:53.650Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-30T11:30:53.650Z"}, "datePublic": "2026-10-14T00:00:00.000Z", "title": "OPNsense core before 26.7.8 Lockout IP Planting via WebGUI Login Username", "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Output Neutralization for Logs", "cweId": "CWE-117", "type": "CWE"}]}], "affected": [{"vendor": "opnsense", "product": "core", "packageURL": "pkg:github/opnsense/core", "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThan": "26.7.8", "status": "affected", "versionType": "semver"}], "repo": "https://github.com/opnsense/core"}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.7.8"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 6.9, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM"}}], "references": [{"url": "https://github.com/opnsense/core/commit/14f8f7dd1d5f06522d60794a7beeac7adb9eca68", "tags": ["patch"]}, {"url": "https://github.com/opnsense/core/commit/2076f2c195bf9537ec220f0e5d6aff998f057410", "tags": ["patch"]}, {"url": "https://github.com/opnsense/core/blob/26.7.7/src/opnsense/mvc/app/library/OPNsense/Auth/AuthenticationFactory.php#L232", "tags": ["technical-description"]}, {"url": "https://github.com/opnsense/core/blob/26.7.7/src/opnsense/scripts/syslog/lockout_handler#L70", "tags": ["technical-description"]}, {"url": "https://github.com/opnsense/core/security/advisories/GHSA-2v2x-m4j7-76pv", "tags": ["vendor-advisory"], "name": "GitHub Security Advisory (GHSA-2v2x-m4j7-76pv)"}, {"url": "https://abraxaslabs.tech/research/opnsense-lockout-factory-ip", "tags": ["third-party-advisory"]}, {"url": "https://github.com/opnsense/core", "tags": ["product"]}, {"name": "VulnCheck Advisory: OPNsense core before 26.7.8 Lockout IP Planting via WebGUI Login Username", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/opnsense-core-before-26.7.8-lockout-ip-planting-via-webgui-login-username"}], "credits": [{"lang": "en", "value": "Abraxas Labs", "type": "finder"}, {"lang": "en", "value": "Ad Schellevis", "type": "remediation developer"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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