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.
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 |
|---|---|---|
| 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: 2026-10-30T11:30:55.121Z
Reserved: 2026-10-30T02:41:13.938Z
Link: CVE-2026-119425
No data.
Status : Received
Published: 2026-10-30T12:16:39.527
Modified: 2026-10-30T12:16:39.527
Link: CVE-2026-119425
No data.
OpenCVE Enrichment
Updated: 2026-10-30T13:30:12Z
Weaknesses