CVE-2026-44195

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 v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS — Exploit Prediction

0.0009

Probability of exploitation

0.25%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-307 CWE-307

Affected Products

Vendor	Product	Versions
opnsense	opnsense	< 26.1.7

References

Advisories & Patches

https://github.com/opnsense/core/security/advisories/GHSA-h3vx-4q27-rc42

Exploits

https://github.com/opnsense/core/security/advisories/GHSA-h3vx-4q27-rc42 https://gist.github.com/sopex/b9786e72e2a5d9b1bbd81ed8477c351b

Frequently Asked Questions

What is CVE-2026-44195? +

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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-44195? +

CVE-2026-44195 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0009, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-44195? +

CVE-2026-44195 affects products from opnsense, specifically: opnsense. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-44195? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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