CVE-2026-119425

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-119425", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-10-30T02:41:13.938Z", "datePublished": "2026-10-30T11:30:55.121Z", "dateUpdated": "2026-10-30T15:55:05.938Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-30T11:30:55.121Z"}, "datePublic": "2026-08-26T00:00:00.000Z", "title": "OPNsense 26.1.6 through 26.7.7 Captive Portal Session Takeover via Forged ARP", "descriptions": [{"lang": "en", "value": "OPNsense core 26.1.6 through 26.7.7 contains an authentication bypass vulnerability in the captive portal roaming feature that lets unauthenticated attackers hijack authorized client sessions by spoofing unauthenticated MAC-to-IP observations. Attackers on the same Layer-2 segment can send forged gratuitous ARP replies binding their IP to a victim's MAC, gaining portal access with traffic attributed to the victim."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Authentication Bypass by Spoofing", "cweId": "CWE-290", "type": "CWE"}]}], "affected": [{"vendor": "opnsense", "product": "core", "packageURL": "pkg:github/opnsense/core", "defaultStatus": "unaffected", "versions": [{"version": "26.1.6", "lessThanOrEqual": "26.7.7", "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:*:*:*:*:*:*:*:*", "versionStartIncluding": "26.1.6", "versionEndIncluding": "26.7.7"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N", "attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM"}}], "references": [{"url": "https://github.com/opnsense/core/security/advisories/GHSA-864r-q4j5-5mjq", "tags": ["vendor-advisory"], "name": "GitHub Security Advisory (GHSA-864r-q4j5-5mjq)"}, {"url": "https://github.com/opnsense/core/commit/f46836d0c3d14e26d79214009bfbfa9a1eecab55", "tags": ["patch"], "name": "Incomplete fix"}, {"url": "https://github.com/opnsense/core/commit/32dc2a3e52eefef5251077f315a0f3243eedb834", "tags": ["patch"], "name": "Incomplete fix (stable/26.7)"}, {"url": "https://github.com/opnsense/core/blob/26.7.7/src/opnsense/scripts/captiveportal/cp-background-process.py#L78", "tags": ["technical-description"]}, {"url": "https://abraxaslabs.tech/research/opnsense-captive-lastseen-roam", "tags": ["third-party-advisory"]}, {"url": "https://github.com/opnsense/core", "tags": ["product"]}, {"name": "VulnCheck Advisory: OPNsense 26.1.6 through 26.7.7 Captive Portal Session Takeover via Forged ARP", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/opnsense-26.1.6-through-26.7.7-captive-portal-session-takeover-via-forged-arp"}], "credits": [{"lang": "en", "value": "lujiefsi", "type": "finder"}, {"lang": "en", "value": "Abraxas Labs", "type": "reporter"}], "x_generator": {"engine": "vulncheck-endgame"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-30T15:20:58.656589Z", "id": "CVE-2026-119425", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-30T15:55:05.938Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-119425", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-30T15:20:58.656589Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-30T15:20:59.426Z"}}], "cna": {"title": "OPNsense 26.1.6 through 26.7.7 Captive Portal Session Takeover via Forged ARP", "credits": [{"lang": "en", "type": "finder", "value": "lujiefsi"}, {"lang": "en", "type": "reporter", "value": "Abraxas Labs"}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "baseScore": 5.3, "attackVector": "ADJACENT", "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW"}}, {"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.4, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}], "affected": [{"repo": "https://github.com/opnsense/core", "vendor": "opnsense", "product": "core", "versions": [{"status": "affected", "version": "26.1.6", "versionType": "semver", "lessThanOrEqual": "26.7.7"}], "packageURL": "pkg:github/opnsense/core", "defaultStatus": "unaffected"}], "datePublic": "2026-08-26T00:00:00.000Z", "references": [{"url": "https://github.com/opnsense/core/security/advisories/GHSA-864r-q4j5-5mjq", "name": "GitHub Security Advisory (GHSA-864r-q4j5-5mjq)", "tags": ["vendor-advisory"]}, {"url": "https://github.com/opnsense/core/commit/f46836d0c3d14e26d79214009bfbfa9a1eecab55", "name": "Incomplete fix", "tags": ["patch"]}, {"url": "https://github.com/opnsense/core/commit/32dc2a3e52eefef5251077f315a0f3243eedb834", "name": "Incomplete fix (stable/26.7)", "tags": ["patch"]}, {"url": "https://github.com/opnsense/core/blob/26.7.7/src/opnsense/scripts/captiveportal/cp-background-process.py#L78", "tags": ["technical-description"]}, {"url": "https://abraxaslabs.tech/research/opnsense-captive-lastseen-roam", "tags": ["third-party-advisory"]}, {"url": "https://github.com/opnsense/core", "tags": ["product"]}, {"url": "https://www.vulncheck.com/advisories/opnsense-26.1.6-through-26.7.7-captive-portal-session-takeover-via-forged-arp", "name": "VulnCheck Advisory: OPNsense 26.1.6 through 26.7.7 Captive Portal Session Takeover via Forged ARP", "tags": ["third-party-advisory"]}], "x_generator": {"engine": "vulncheck-endgame"}, "descriptions": [{"lang": "en", "value": "OPNsense core 26.1.6 through 26.7.7 contains an authentication bypass vulnerability in the captive portal roaming feature that lets unauthenticated attackers hijack authorized client sessions by spoofing unauthenticated MAC-to-IP observations. Attackers on the same Layer-2 segment can send forged gratuitous ARP replies binding their IP to a victim's MAC, gaining portal access with traffic attributed to the victim."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-290", "description": "Authentication Bypass by Spoofing"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndIncluding": "26.7.7", "versionStartIncluding": "26.1.6"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-30T11:30:55.121Z"}}}, "cveMetadata": {"cveId": "CVE-2026-119425", "state": "PUBLISHED", "dateUpdated": "2026-10-30T15:55:05.938Z", "dateReserved": "2026-10-30T02:41:13.938Z", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "datePublished": "2026-10-30T11:30:55.121Z", "assignerShortName": "VulnCheck"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageURL": "pkg:github/opnsense/core", "product": "core", "repo": "https://github.com/opnsense/core", "vendor": "opnsense", "versions": [{"lessThanOrEqual": "26.7.7", "status": "affected", "version": "26.1.6", "versionType": "semver"}]}], "source": "disclosure@vulncheck.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "OPNsense core 26.1.6 through 26.7.7 contains an authentication bypass vulnerability in the captive portal roaming feature that lets unauthenticated attackers hijack authorized client sessions by spoofing unauthenticated MAC-to-IP observations. Attackers on the same Layer-2 segment can send forged gratuitous ARP replies binding their IP to a victim's MAC, gaining portal access with traffic attributed to the victim."}], "id": "CVE-2026-119425", "lastModified": "2026-10-30T19:23:25.493", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.5, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "ADJACENT", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-119425", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-30T15:20:58.656589Z", "version": "2.0.3"}}]}, "published": "2026-10-30T12:16:39.527", "references": [{"source": "disclosure@vulncheck.com", "url": "https://abraxaslabs.tech/research/opnsense-captive-lastseen-roam"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/opnsense/core"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/opnsense/core/blob/26.7.7/src/opnsense/scripts/captiveportal/cp-background-process.py#L78"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/opnsense/core/commit/32dc2a3e52eefef5251077f315a0f3243eedb834"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/opnsense/core/commit/f46836d0c3d14e26d79214009bfbfa9a1eecab55"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/opnsense/core/security/advisories/GHSA-864r-q4j5-5mjq"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/opnsense-26.1.6-through-26.7.7-captive-portal-session-takeover-via-forged-arp"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-290"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[26.1.6,26.7.7]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "core", "source": "cna", "vendor": "opnsense"}, "product": "core", "vendor": "opnsense"}, {"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "opnsense", "vendor": "opnsense"}], "created": "2026-10-30T13:15:15.926074+00:00", "updated": "2026-10-30T13:30:12.098317+00:00", "vendors": ["opnsense", "opnsense$PRODUCT$core", "opnsense$PRODUCT$opnsense"]}