Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://abraxaslabs.tech/research/opnsense-captive-lastseen-roam
- https://github.com/opnsense/core
- https://github.com/opnsense/core/blob/26.7.7/src/opnsense/scripts/captiveportal/
- https://github.com/opnsense/core/commit/32dc2a3e52eefef5251077f315a0f3243eedb834
- https://github.com/opnsense/core/commit/f46836d0c3d14e26d79214009bfbfa9a1eecab55
- https://github.com/opnsense/core/security/advisories/GHSA-864r-q4j5-5mjq
- https://www.vulncheck.com/advisories/opnsense-26.1.6-through-26.7.7-captive-port
FAQ
What is CVE-2026-119425?
CVE-2026-119425 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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 spoof...
How severe is CVE-2026-119425?
CVE-2026-119425 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-119425?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.