Medium severity · published May 13, 2026
CVE-2026-44195
OPNsense: Authentication lockout bypass
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 25% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
core · opnsense
< 26.1.7 · source: vendor
OP
Opnsense · Opnsense
before 26.1.7 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44195
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44195
Exploit
https://github.com/opnsense/core/security/advisories/GHSA-h3vx-4q27-rc42
Exploit
https://gist.github.com/sopex/b9786e72e2a5d9b1bbd81ed8477c351b
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