Fortinet FortiClient EMS Improper Access Control Vulnerability

Technical Severity

CVSS v3.1 Metrics

CRITICAL

9.8 / 10

Minimal Risk Critical

Vector Specification

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation Likelihood

EPSS Prediction

5.95 %

Predictive Probability

Percentile Rank

90.6 th

Documented as more likely to be exploited than 90.6% of known CVEs.

Detection Date

Apr 06, 2026

Remediation Due

Apr 09, 2026

CISA Catalog Active

Threat Analysis

Fortinet FortiClient EMS contains an improper access control vulnerability that may allow an unauthenticated attacker to execute unauthorized code or commands via crafted requests.

Remediation Directive

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

External Intelligence

Please adhere to Fortinet's guidelines to assess exposure and mitigate risks. Check for signs of potential compromise on all internet accessible Fortinet products affected by this vulnerability. Apply any final mitigations provided by the vendor as soon as they become available. For more information please see:

https://fortiguard.fortinet.com/psirt/FG-IR-26-099

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2026-35616