CVE-2026-44195: medium-severity vulnerability in opnsense core
OPNsense: Authentication lockout bypass
Published · Updated
33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 5.3epss 0.4%
exploitation probability
0.4%top 70% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.7, a logic flaw in the OPNsense lockout_handler allows an unauthenticated attacker to continuously reset the authentication failure counter for their IP address. By interjecting a crafted username containing a success keyword ("Accepted" or "Successful login") between normal brute-force attempts, an attacker can prevent the failure counter from ever reaching the lockout threshold. This vulnerability is fixed in 26.1.7.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products
opnsense · corepublic PoCs found — 1
cve_referencegist.github.com/sopex/b9786e72e2a5d9b1bbd81ed8477c351bunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — opnsense core
In the same product, most dangerous first.
CVE-2026-44193CRITICALOPNsense: RCE via XMLRPC endpoint using `opnsense.restore_config_section` methodEPSS 0.9%CVE-2026-45158CRITICALOPNsense: Command Injection via Attacker-Controlled DHCP ConfigEPSS 0.8%CVE-2026-44194CRITICALOPNsense: RCE on user managmentEPSS 0.8%CVE-2026-34578HIGHOPNsense has an LDAP Injection via Unsanitized Username in AuthenticationEPSS 0.5%CVE-2026-53581CRITICALntp: write path traversalEPSS 0.5%CVE-2026-30868MEDIUMCross-Site Request Forgery (CSRF) in opnsense/coreEPSS 0.2%