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NCSC-2026-0243 [1.00] [M/H] Vulnerability fixed in Fortinet FortiClient EMS

unknownCVE-2026-59836
Fortinet has fixed a vulnerability in FortiClient EMS versions 7.2 to 7.4.5. The vulnerability concerns improper validation of certificates within FortiClient EMS. This allows an external, unauthenticated attacker to impersonate an Active Directory Connector by using a valid API key. Exploitation of this vulnerability may lead to unauthorized information leaks.

CSIRTS triage

What
Improper validation of certificates allows an attacker to impersonate an Active Directory Connector.
Who is affected
Deployments of FortiClient EMS versions 7.2 to 7.4.5 are affected.
Urgency
Remediation is urgent due to the potential for unauthorized information leaks.
Action
Update FortiClient EMS to the latest version to mitigate this vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
NCSC-NL Advisories (NL · national-cert · site)
Severity
unknown
Published
2026-07-17
Exploitation
Not in CISA KEV at last sync
Language
Machine-translated to English — verify against the original

Original advisory: https://advisories.ncsc.nl/advisory?id=NCSC-2026-0243

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-59836coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Fortinet FortiClient EMS

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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