CVE-2026-44194

critical · 9.1

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

6.4%

EPSS (exploit prob.)

93rd

EPSS percentile

2026-05-13

Published

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

Weaknesses

CWE-78

Affected products

Vendor	Product	Affected versions
opnsense	opnsense	< 26.1.8

Check a specific version with /api/v1/cve/match.

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-44194