Cyber Resilience

CVE-2026-44194

CriticalPublic PoCRCE

Published: 13 May 2026

Published
13 May 2026
Modified
15 May 2026
KEV Added
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Patch
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CVSS Score v3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS Score 0.0635 92.8th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-44194 is a critical-severity OS Command Injection (CWE-78) vulnerability in Opnsense Opnsense. Its CVSS base score is 9.1 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 7.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability details

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…

more

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.

CWE(s)
CWE-78

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
Why these techniques?

Authenticated RCE via OS command injection (CWE-78) in the web management interface directly enables exploitation of a public-facing application and Unix shell command execution as root.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-45158Same product: Opnsense Opnsense
CVE-2025-50989Same product: Opnsense Opnsense
CVE-2026-44193Same product: Opnsense Opnsense
CVE-2026-30868Same product: Opnsense Opnsense
CVE-2026-34578Same product: Opnsense Opnsense
CVE-2018-25115Shared CWE-78
CVE-2025-24382Shared CWE-78
CVE-2026-29058Shared CWE-78
CVE-2024-57016Shared CWE-78
CVE-2024-46484Shared CWE-78

Affected Assets

opnsense
opnsense
≤ 26.1.8

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation
addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

References