CVE-2026-119425mediumCWE-290

CVE-2026-119425: medium-severity vulnerability in opnsense core

OPNsense 26.1.6 through 26.7.7 Captive Portal Session Takeover via Forged ARP

Published

Follow this CVE+ Monitor core

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.3epss 0.3%
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:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Affected products
opnsense · core
Related CVEs — opnsense core

In the same product, most dangerous first.

CVE-2026-44194CRITICALOPNsense: RCE on user managmentEPSS 5.7%CVE-2026-119409HIGHOPNsense before 26.7.8 Root Command Injection via Firmware Mirror SettingEPSS 2.5%CVE-2026-57155CRITICALOPNsense: Root RCE via Arbitrary File Write in GeoIP Alias ImporterEPSS 0.9%CVE-2026-53582HIGHOPNsense: XPATH Injection can disclose any secret in config.xmlEPSS 0.7%CVE-2026-44193CRITICALOPNsense: RCE via XMLRPC endpoint using `opnsense.restore_config_section` methodEPSS 0.7%CVE-2026-58390HIGHOPNsense: Stored XSS to root RCE via OpenVPN client common_name in status viewsEPSS 0.6%