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.
Metrics
Affected Vendors & Products
Advisories
No advisories yet.
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Fri, 30 Oct 2026 13:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Opnsense core
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| Vendors & Products |
Opnsense core
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Fri, 30 Oct 2026 11:45:00 +0000
| Type | Values Removed | Values Added |
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| 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. | |
| Title | OPNsense 26.1.6 through 26.7.7 Captive Portal Session Takeover via Forged ARP | |
| First Time appeared |
Opnsense
Opnsense opnsense |
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| Weaknesses | CWE-290 | |
| CPEs | cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Opnsense
Opnsense opnsense |
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| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-10-30T15:55:05.938Z
Reserved: 2026-10-30T02:41:13.938Z
Link: CVE-2026-119425
No data.
Status : Received
Published: 2026-10-30T12:16:39.527
Modified: 2026-10-30T16:17:44.867
Link: CVE-2026-119425
No data.
OpenCVE Enrichment
Updated: 2026-10-30T13:30:12Z
Weaknesses