OPNsense: Authentication lockout bypass_CVE-2026-44195

5.3 / 10

MEDIUM

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

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.

Basic Information

ID CVE-2026-44195

Source GitHub_M

Published May 13, 2026 at 21:52

Affected Product

Vendor opnsense

Product core

Version < 26.1.7

Affected Versions opnsense core < 26.1.7

CWE Classification

CWE-307

References

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

{
    "lastseen": "",
    "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.",
    "published": "2026-05-13T21:52:42.373Z",
    "modified": "2026-05-13T21:52:42.373Z",
    "type": "cve",
    "title": "OPNsense: Authentication lockout bypass",
    "source": "GitHub_M",
    "references": "https://github.com/opnsense/core/security/advisories/GHSA-h3vx-4q27-rc42",
    "id": "CVE-2026-44195",
    "bulletinFamily": "",
    "cwe": [
        "CWE-307"
    ],
    "cvelist": null,
    "sourceData": "opnsense core < 26.1.7",
    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "core",
    "version": "< 26.1.7",
    "vendor": "opnsense",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}