What is CVE-2026-66154?

CVE-2026-66154 is a high-severity vulnerability in Sonicwall Gms, classified under Improper Certificate Validation. CVSS score: 8.3/10. Published 2026-08-11.

How severe is CVE-2026-66154?

High severity. CVSS v3 base score is 8.3 out of 10.

Vulnerability in Sonicwall Gms

CVE-2026-66154

An insufficient certificate validation in a privileged communication workflow, was identified in a GMS application 9.5.1 (Build 9510.1044) and earlier versions which, under a successful MitM attack and controlled network conditions, could…

Vulnerability class: Improper Certificate Validation

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Sonicwall Gms — versions 9.5.1 and earlier versions

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

PSIRT@sonicwall.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-66154?: CVE-2026-66154 is a high-severity vulnerability in Sonicwall Gms, classified under Improper Certificate Validation. CVSS score: 8.3/10. Published 2026-08-11.
How severe is CVE-2026-66154?: High severity. CVSS v3 base score is 8.3 out of 10.