{"id":"CVE-2026-119425","aliases":[],"cve":{"records":[{"id":"CVE-2026-119425","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-30T02:41:13.938Z","published":"2026-10-30T11:30:55.121Z","modified":"2026-10-30T15:55:05.938Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-10-30T11:30:55.121Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-30T15:55:05.938Z"}],"references":[{"url":"https://github.com/opnsense/core/security/advisories/GHSA-864r-q4j5-5mjq","tags":["vendor-advisory"],"source":"VulnCheck"},{"url":"https://github.com/opnsense/core/commit/f46836d0c3d14e26d79214009bfbfa9a1eecab55","tags":["patch"],"source":"VulnCheck"},{"url":"https://github.com/opnsense/core/commit/32dc2a3e52eefef5251077f315a0f3243eedb834","tags":["patch"],"source":"VulnCheck"},{"url":"https://github.com/opnsense/core/blob/26.7.7/src/opnsense/scripts/captiveportal/cp-background-process.py#L78","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://abraxaslabs.tech/research/opnsense-captive-lastseen-roam","tags":["third-party-advisory"],"source":"VulnCheck"},{"url":"https://github.com/opnsense/core","tags":["product"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/opnsense-26.1.6-through-26.7.7-captive-portal-session-takeover-via-forged-arp","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-290","description":"Authentication Bypass by Spoofing","source":"VulnCheck"}],"applicability":[{"source":"VulnCheck","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:*","versionStartIncluding":"26.1.6","versionEndIncluding":"26.7.7"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-30T15:20:58.656589Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"partial"}]}]},"title":"OPNsense 26.1.6 through 26.7.7 Captive Portal Session Takeover via Forged ARP","titleSource":"VulnCheck","descriptionSource":"VulnCheck","description":"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.","score":5.4,"severity":"medium","published":"2026-10-30T11:30:55.121Z","modified":"2026-10-30T15:55:05.938Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"opnsense","name":"core","platforms":[],"versions":[{"version":"26.1.6","status":"affected","lessThanOrEqual":"26.7.7","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:github/opnsense/core","cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-119425"}],"remediation":[],"references":["https://github.com/opnsense/core/security/advisories/GHSA-864r-q4j5-5mjq","https://github.com/opnsense/core/commit/f46836d0c3d14e26d79214009bfbfa9a1eecab55","https://github.com/opnsense/core/commit/32dc2a3e52eefef5251077f315a0f3243eedb834","https://github.com/opnsense/core/blob/26.7.7/src/opnsense/scripts/captiveportal/cp-background-process.py#L78","https://abraxaslabs.tech/research/opnsense-captive-lastseen-roam","https://github.com/opnsense/core","https://www.vulncheck.com/advisories/opnsense-26.1.6-through-26.7.7-captive-portal-session-takeover-via-forged-arp"],"sources":[{"name":"CVE","id":"CVE-2026-119425","modified":"2026-10-30T15:55:05.938Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-119425"}],"assessments":[{"source":"VulnCheck","vector":"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","score":5.3},{"source":"VulnCheck","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","score":5.4}],"sourceAffected":[],"observedAt":"2026-10-30T17:19:47.226Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T09:10:30.844Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":{"text":"OPNsense core versions 26.1.6 through 26.7.7 have an authentication bypass vulnerability in the captive portal roaming feature, allowing attackers on the same Layer-2 segment to hijack authorized client sessions by spoofing MAC-to-IP observations. Attackers can send forged ARP replies to gain portal access.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T11:46:25.105Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-119425"}]}}