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CVE-2026-44194

OPNsense: RCE on user managment

Published: May 13, 2026Updated: May 15, 2026 Sources: CVE List NVD BDUCWE-78
NVD MITRE
9.1CVSSCRITICAL
EPSS Score
6.4%
Top 7.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:HUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-78

Affected Products

OPNsenseСообщество свободного программного обеспечения
On-prem
Operating Systems / linux-distro
coreopnsense
On-prem
Networking Infrastructure / firewall
opnsenseopnsense
On-prem
Networking Infrastructure / firewall
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
opnsenseoss-projectNetworking Infrastructure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

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

Timeline

Published
May 13, 2026
Last Updated
May 15, 2026

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