CVE-2026-119423

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    CVE-2026-119423

    Published: 30 Oct 2026Last Modified: 5 Nov 2026

    Summary: OPNsense core before 26.7.8 Lockout IP Planting via WebGUI Login Username

    Details: 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.

    References: https://abraxaslabs.tech/research/opnsense-lockout-factory-ip, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/119xxx/CVE-2026-119423.json, https://github.com/opnsense/core/security/advisories/GHSA-2v2x-m4j7-76pv, https://nvd.nist.gov/vuln/detail/CVE-2026-119423, https://www.vulncheck.com/advisories/opnsense-core-before-26.7.8-lockout-ip-planting-via-webgui-login-username, https://github.com/opnsense/core/commit/14f8f7dd1d5f06522d60794a7beeac7adb9eca68, https://github.com/opnsense/core/commit/2076f2c195bf9537ec220f0e5d6aff998f057410, https://github.com/opnsense/core, https://github.com/opnsense/core/blob/26.7.7/src/opnsense/mvc/app/library/OPNsense/Auth/AuthenticationFactory.php#L232, https://github.com/opnsense/core/blob/26.7.7/src/opnsense/scripts/syslog/lockout_handler#L70

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -96978001a8343669154e4492172ce0a07dac7e4b

    Affected versions

    26.7.7
    26.7.6
    26.7.5
    26.7.4
    26.7.3
    26.7.2
    26.7.1
    26.7
    26.7.r2
    26.7.r1
    26.7.r
    26.7.b
    26.7.a

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-119423 | CVE-DB