SB2026071491 - Improper certificate validation in AD Connector communication with FortiClient EMS
Published: July 14, 2026
Security Bulletin ID
SB2026071491
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Certificate Validation (CVE-ID: CVE-2026-59836)
CWE-ID: CWE-295 - Improper Certificate Validation
CVSSv4: 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
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.
Remediation
Install update from vendor's website.