CVE-2026-44194CRITICAL 9.1EPSS p92.8%

CVE-2026-44194CVE-2026-44194

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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS6.35% probability of exploitation · percentile 92.8% · 2026-06-18T12:00:27Z
Published2026-05-13
Last modified2026-05-15

Underlying weaknesses· 1

CWE-78

References

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

1

TypeTargetConfidenceTier
WeaknessImproper Neutralization of Special Elements used in an OS Command ('OS Command Injection')cwe-780%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.