Quick answers
- Is CVE-2026-119423 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-119423 being exploited in the wild.
- How severe is CVE-2026-119423?
- Medium severity, with a CVSS score of 5.3, published 30 October 2026.
- Which products and versions are affected?
- OPNsense Core before 26.7.8.
- Is there a fix for CVE-2026-119423?
- Yes: fixed in 26.7.8. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-119423 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-119423?
- Check whether you run OPNsense Core at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 26.7.8
Technical details
A log injection vulnerability in the lockout_handler component of OPNsense core allows unauthenticated attackers to submit crafted WebGUI login usernames that inject victim IP addresses into the sshlockout table. By submitting usernames containing patterns like "Invalid user <victim-ip>", an attacker can trigger firewall rules that block SSH and WebGUI access for arbitrary IPs and terminate their active pf states. No authentication is required to exploit this network-accessible vulnerability.
Affected products
- OPNsense core before 26.7.8
Timeline
- 2026-10-30: disclosed