Improper Certificate Validation in SonicWall GMS - CVE-2026-66154
Published: August 11, 2026
Vulnerability identifier: #VU141449
CSH Severity: Medium
CVSS v4: 6 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-66154
CWE-ID: CWE-295
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to make unauthorized changes.
The vulnerability exists due to improper certificate validation in a privileged communication workflow when operating under a machine-in-the-middle position on the local network. A remote attacker can intercept and manipulate communication to make unauthorized changes.
Exploitation requires controlled network conditions.
Affected software
SonicWall GMS
How to mitigate CVE-2026-66154
Install security update from vendor's website.
SonicWall GMS - update to 9.5.2