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Vulnerability record · CVE-2026-44194 · published 13 May 2026

CVE-2026-44194: Opnsense os command injection vulnerability

Opnsense · Opnsense

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.

9.1 CVSS 3.1 Critical EPSS 0.82% · top 44.5% CWE-78 · OS command injection
9.1CVSS 3.1 base score
0.82%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/opnsense/core/security/advisories/GHSA-f59w-m967-9rf6 ExploitMitigationVendor Advisory
https://github.com/opnsense/core/security/advisories/GHSA-f59w-m967-9rf6 ExploitMitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-27152Opnsense improper restriction of authentication attempts vulnerabilityDECISO OPNsense 23.1 does not impose rate limits for authentication, allowing attackers to perform a brute-force attack to bypass authentication.EPSS 0.89%9.8CVE-2023-39004Opnsense incorrect permission assignment vulnerabilityInsecure permissions in the configuration directory (/conf/) of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allow attac…EPSS 0.99%9.8CVE-2023-39008Opnsense command injection vulnerabilityA command injection vulnerability in the component /api/cron/settings/setJob/ of OPNsense Community Edition before 23.7 and Business Edition before 2…EPSS 3.1%9.8CVE-2023-39001Opnsense command injection vulnerabilityA command injection vulnerability in the component diag_backup.php of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allow…EPSS 3.6%9.6CVE-2023-39007Opnsense cross-site scripting vulnerability/ui/cron/item/open in the Cron component of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allows XSS via openAction in ap…EPSS 2.6%9.1CVE-2026-45158Opnsense argument injection vulnerabilityOPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.8, unsanitized user input is passed to the DHCP configuration of the configu…EPSS 0.82%9.1CVE-2026-44193Opnsense argument injection vulnerabilityOPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.7, the XMLRPC method opnsense.restore_config_section fails to sanitize user …EPSS 0.86%9.1CVE-2025-50989Opnsense os command injection vulnerabilityOPNsense before 25.1.8 contains an authenticated command injection vulnerability in its Bridge Interface Edit endpoint (interfaces_bridge_edit.php). …EPSS 8.4%

Source: NIST National Vulnerability Database (record CVE-2026-44194), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.