CVE-2026-44194
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (6.35%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 6.35% probability · 93th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-78
- Affected
- opnsense/opnsense
- Source
- security-advisories@github.com
References
- https://github.com/opnsense/core/security/advisories/GHSA-f59w-m967-9rf6Exploit, Mitigation, Vendor Advisory
- https://github.com/opnsense/core/security/advisories/GHSA-f59w-m967-9rf6Exploit, Mitigation, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.