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CVE-2026-44194

⛔ critical
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Summary

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/opnsen

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 Score
9.1
Critical
EPSS Score
0.1
Exploit Probability
Published Date
2026-05-13
First Seen: 2026-05-17
📊 Relative Risk Intelligence

This CVE is High Risk - more severe than 87.7% of all 329,456 vulnerabilities in our database.

#40,532
Top 25% most severe
Severity Percentile
🎯 CISA SSVC Assessment Updated: May 15, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Total
Complete system compromise possible
SSVC data provided by CISA
Last Modified 2026-05-15
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE IDs (Weakness Types)
CWE-78

📦 Affected Products 1

Vendor Product Status Affected Versions
opnsense opnsense Affected
< 26.1.8

🔗 References 1

https://github.com/opnsense/core/security/advisories...
Exploit Mitigation Vendor Advisory

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-44193 ⛔ critical 9.1 0.3 OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.7, the XMLRPC method opnsense.restore_config_se... 2026-05-13
CVE-2026-44195 🔶 medium 5.3 0.1 OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.7, a logic flaw in the OPNsense lockout_handler... 2026-05-13
CVE-2026-45158 ⛔ critical 9.1 0.2 OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.8, unsanitized user input is passed to the DHCP... 2026-05-13
CVE-2026-34578 ⚠️ high 8.2 0.3 OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.6, OPNsense's LDAP authentication connector pas... 2026-04-09
CVE-2026-30868 🔶 medium 6.3 0.0 OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.4, multiple OPNsense MVC API endpoints perform ... 2026-03-11
CVE-2019-25368 🔶 medium 5.4 0.0 OPNsense 19.1 contains multiple cross-site scripting vulnerabilities in the diag_backup.php endpoint that allow attacker... 2026-02-15
These CVEs affect the same products