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CVE-2026-44194

Opnsense remote code execution

9.1 CRITICALPublic exploitEPSS 0.82%
  1. Published13 May 2026

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

Opnsense< 26.1.8

Remediation

Fixed in
Opnsense≥ 26.1.8

References

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Frequently asked

Is CVE-2026-44194 being actively exploited?

CVE-2026-44194 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.82%.

How severe is CVE-2026-44194?

CVE-2026-44194 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.82% probability of exploitation.

Which products are affected by CVE-2026-44194?

Affected products include Opnsense.

How do I fix CVE-2026-44194?

Upgrade affected software to a fixed version, for example Opnsense 26.1.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-44194 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.