CVE WatchOct 26, 2026

CVE-2026-44194

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.8, an authenticated Remote Code Execution (RCE) vulnerability in th

CVSS

9.1

Critical

EPSS

5.7%

p93

KEV

—

Exploit Today

0-100

Published: May 13, 2026 · Last modified: Oct 26, 2026 · CWE-78

EPSS · 30d

0.8%EPSS · 30 days5.7%

2026-10-062026-11-02

Technical 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.

Official references

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