CVE-2026-119423
Published:October 30, 2026
Updated:November 04, 2026
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.
Affected Packages
https://github.com/opnsense/core.git (GITHUB):
Affected version(s) >=21.1.6 <26.7.8 || >=22.1 <26.7.8 || >=23.1 <26.7.8 || >=24.1 <26.7.8 || >=25.1 <26.7.8 || >=26.1 <26.7.8Fix Suggestion:
Update to version 26.7.8Related Resources (10)
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Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Improper Output Neutralization for Logs
EPSS
Base Score:
0.38