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CVE-2026-44194— OPNsense: RCE on user managment

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公司的一个防火墙与路由器操作系统。 Deciso OPNsense 26.1.8之前版本存在操作系统命令注入漏洞，该漏洞源于本地用户同步流程中，攻击者可通过将恶意负载格式化为合规电子邮件地址绕过输入验证，导致具有用户管理权限的用户以root身份执行任意系统命令。

CVSS 9.1 · Critical EPSS 0.82% · P56

Affected Version Matrix 1

VendorProduct Version RangeStatus
opnsense core < 26.1.8 affected
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I. Basic Information for CVE-2026-44194

Vulnerability Information
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Vulnerability Title
OPNsense: RCE on user managment
Source: CVE Program / CVE List V5
Vulnerability Description
OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.8, an authenticated Remote Code Execution (RCE) vulnerability in the OPNsense core allows a user with user-management privileges to execute arbitrary system commands as root. An attacker can bypass input validation by formatting their malicious payload as a compliant email address, allowing shell commands to reach the underlying operating system. The flaw exists in the local user synchronization flow, within core/src/opnsense/scripts/auth/sync_user.php. This vulnerability is fixed in 26.1.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Deciso OPNsense 操作系统命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Deciso OPNsense是荷兰Deciso公司的一个防火墙与路由器操作系统。 Deciso OPNsense 26.1.8之前版本存在操作系统命令注入漏洞，该漏洞源于本地用户同步流程中，攻击者可通过将恶意负载格式化为合规电子邮件地址绕过输入验证，导致具有用户管理权限的用户以root身份执行任意系统命令。
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 < 26.1.8 -

II. Public POCs for CVE-2026-44194

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III. Intelligence Information for CVE-2026-44194

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Vendor Advisories for CVE-2026-44194 (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-2026-44195 5.3 MEDIUM OPNsense: Authentication lockout bypass

IV. Related Vulnerabilities

Same product: core
Same vendor: opnsense
Same weakness: CWE-78

V. Comments for CVE-2026-44194

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