CVE-2026-44194
Critical · 9.1CVSS
9.1
EPSS
0.8%
Published
May 13, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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