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CVE-2026-44195— OPNsense: Authentication lockout bypass

Quick assessment

Affected
opnsense core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Deciso OPNsense是荷兰Deciso公司的一套基于FreeBSD的开源防火墙和路由软件。 Deciso OPNsense 26.1.7之前版本存在安全漏洞，该漏洞源于lockout_handler中的逻辑缺陷，允许未经身份验证的攻击者通过插入包含成功关键字的用户名，持续重置其IP地址的身份验证失败计数器。

CVSS 5.3 · Medium EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1110.004 · Credential Stuffing

Affected Version Matrix 1

VendorProduct Version RangeStatus
opnsense core < 26.1.7 affected
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I. Basic Information for CVE-2026-44195

Vulnerability Information
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Vulnerability Title
OPNsense: Authentication lockout bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
过多认证尝试的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Deciso OPNsense 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Deciso OPNsense是荷兰Deciso公司的一套基于FreeBSD的开源防火墙和路由软件。 Deciso OPNsense 26.1.7之前版本存在安全漏洞，该漏洞源于lockout_handler中的逻辑缺陷，允许未经身份验证的攻击者通过插入包含成功关键字的用户名，持续重置其IP地址的身份验证失败计数器。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
opnsense core < 26.1.7 -

II. Public POCs for CVE-2026-44195

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III. Intelligence Information for CVE-2026-44195

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Vendor Advisories for CVE-2026-44195 (1)

Same Patch Batch · opnsense · 2026-05-13 · 4 CVEs total

CVE-2026-45158 9.1 CRITICAL OPNsense: Command Injection via Attacker-Controlled DHCP Config
CVE-2026-44193 9.1 CRITICAL OPNsense: RCE via XMLRPC endpoint using `opnsense.restore_config_section` method
CVE-2026-44194 9.1 CRITICAL OPNsense: RCE on user managment

IV. Related Vulnerabilities

Same product: core
Same vendor: opnsense
Same weakness: CWE-307

V. Comments for CVE-2026-44195

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