Improper Certificate Validation in FortiClientEMS - CVE-2026-59836
Published: July 14, 2026
Vulnerability identifier: #VU137524
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-59836
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Fortinet, Inc
Affected software:
FortiClientEMS
FortiClientEMS
Detailed vulnerability description
The vulnerability allows a remote attacker to impersonate an AD Connector.
The vulnerability exists due to improper certificate validation in AD Connector communication when verifying a connection using a valid API key. A remote attacker can present a crafted certificate to impersonate an AD Connector.
User interaction is required.
How to mitigate CVE-2026-59836
Install security update from vendor's website.