CVE-2026-59836: A improper certificate validation vulnerability in Fortinet FortiClientEMS 7.4.3 through 7.4.5, FortiClientEMS 7.4.0 through 7.4.1, FortiClientEMS 7.2 all versions may allow attack

highCVSS 7.5CVE-2026-59836

A improper certificate validation vulnerability in Fortinet FortiClientEMS 7.4.3 through 7.4.5, FortiClientEMS 7.4.0 through 7.4.1, FortiClientEMS 7.2 all versions may allow attacker to information disclosure via <insert attack vector here>

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 7.5
Published: 2026-07-14
Last updated: 2026-07-15
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-59836

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.

Low exploitation riskCVE-2026-598360.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-59836	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownNCSC-2026-0243 [1.00] [M/H] Vulnerability fixed in Fortinet FortiClient EMSncsc-nl
medium[NEW] [medium] Fortinet FortiClient EMS: Vulnerability allows bypassing security measurescert-bund
unknownMultiple vulnerabilities in Fortinet products (July 15, 2026)cert-fr-avis
unknownMissed certificate verification in AD Connector communication with FortiClient EMSfortinet

Recent advisories for A improper certificate

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.

mediumCVE-2026-67294: FreeRDP before 3.29.0 improperly validates the Extended Key Usage (EKU) purpose of the peer ce…nvd · 2026-08-01
mediumCVE-2026-67293: FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains an improper certificate hostname …nvd · 2026-08-01
highCVE-2026-8497: Improper certificate validation in the Devolutions Server connection handling in Devolutions Pa…nvd · 2026-07-29
mediumCVE-2026-18257: Improper validity period check for root issuer certificate in CycloneCrypto cryptographic wrap…nvd · 2026-07-29
mediumCVE-2026-16107: IBM TS4500 CLI tool Versions: 0.1.31 through 1.12.0.0 does not validate or improperly validate…nvd · 2026-07-28
mediumCVE-2026-66053: Improper Validation of Certificate with Host Mismatch vulnerability in Apache Thrift Python bi…nvd · 2026-07-27