CVE-2026-44195— OPNsense: Authentication lockout bypass
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-44195
Vulnerability Information
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Vulnerability Title
OPNsense: Authentication lockout bypass
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
过多认证尝试的限制不恰当
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2026-44195
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Vendor Advisories for CVE-2026-44195 (1)
- 🔗 Authentication lockout bypass · Advisory · opnsense/core · GitHubx_refsource_CONFIRM
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
- CVE-2026-44473
Ella Core: UE Downlink Redirection via Forged PDUSessionReso - CVE-2026-44475
Ella Core: UE Security Capability bypass on NGAP PathSwitchR - CVE-2026-44474
Ella Core: Handover failures during concurrent Security Mode - CVE-2026-45158
OPNsense: Command Injection via Attacker-Controlled DHCP Con - CVE-2026-44194
OPNsense: RCE on user managment
Same vendor: opnsense
- CVE-2026-45158
OPNsense: Command Injection via Attacker-Controlled DHCP Con - CVE-2026-44194
OPNsense: RCE on user managment - CVE-2026-44193
OPNsense: RCE via XMLRPC endpoint using `opnsense.restore_co - CVE-2026-34578
OPNsense has an LDAP Injection via Unsanitized Username in A - CVE-2026-30868
Cross-Site Request Forgery (CSRF) in opnsense/core
Same weakness: CWE-307
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V. Comments for CVE-2026-44195
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