CVE-2026-119423mediumCWE-117

CVE-2026-119423: medium-severity vulnerability in opnsense core

OPNsense core before 26.7.8 Lockout IP Planting via WebGUI Login Username

Published · Updated

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 6.9epss 0.4%
OPNsense core before 26.7.8 contains a log injection vulnerability that allows unauthenticated attackers to plant victim IP addresses in the lockout_handler by submitting crafted WebGUI login usernames. Attackers can submit usernames like 'Invalid user <victim-ip>' repeatedly to add the victim to the sshlockout table, blocking SSH and WebGUI access and killing its pf states.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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%