CVE-2026-59836: Fortinet Missed certificate verification in AD Connector communication with FortiClient EMS
This Fortinet advisory covers CVE-2026-59836 in FortiClientEMS.
- CVE-2026-59836
Key facts
- Vendor rating
- High, CVSS 7.5
- CISA KEV
- Not listed (catalogue checked )
- Affected
- FortiClientEMS FortiClientEMS: 7.2 through 8.0 (vendor-listed versions)
- Fixed in
- FortiClientEMS 7.4: 7.4.6, FortiClientEMS 7.2: migrate to a fixed release
- Advisory id
- FG-IR-26-147
- Source published
- Source revised
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
CVSSv3 Score:
7.5
An Improper Certificate Validation vulnerability [CWE-295] in FortiClient EMS may allow a remote unauthenticated attacker to impersonate an AD Connector via a valid API Key.
Revised on 2026-07-14 00:00:00
Affected product named by the advisory: FortiClientEMS.
Text from the source record.
- FortiClientEMS FortiClientEMS: 7.2 through 8.0 (vendor-listed versions)
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-59836
Upgrade to a fixed release named by Fortinet:
- FortiClientEMS 7.4: 7.4.6
- FortiClientEMS 7.2: migrate to a fixed release
Vendor guidance
- Upgrade per the Affected/Solution table: FortiClientEMS 7.4: 7.4.6; FortiClientEMS 7.2: migrate to a fixed release.
More Fortinet advisories
CVE-2026-39809Apr 14, 2026Multiple SQL InjectionsCVE-2026-21643Feb 6, 2026FortiClientEMS SQL injectionCVE-2024-21753Sep 10, 2024FortiClientEMS path traversalCVE-2023-47534Mar 12, 2024FortiClientEMS CSV injectionCVE-2023-45581Feb 15, 2024FortiClientEMS privilege escalationCVE-2026-98432Nov 2, 2026Linux kernel RCE CVE-2026-98432
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