CVE-2026-119425 Details
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.
A vulnerability allowing authentication bypass has been identified in the OPNsense core versions 26.1.6 through 26.7.7. This issue arises in the captive portal roaming feature, where unauthenticated attackers can hijack authorized client sessions. The vulnerability is exploited by spoofing MAC-to-IP observations. Attackers on the same Layer-2 segment can send forged ARP replies that bind their IP address to that of a victim's MAC, thereby gaining portal access while traffic is attributed to the victim.
Users can update to OPNsense versions 26.7.3 or 26.4.2p1, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 30, 2026CISA-ADP
Assessed Oct 30, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-290 | Authentication Bypass by Spoofing | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| OPNsense | >= 26.1.6, <= 26.7.7 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 30, 2026 | CVE Modified | CISA-ADP |
| Oct 30, 2026 | New CVE Received | [email protected] |