Fortinet FortiClient EMS Improper Access Control Vulnerability
Fortinet FortiClient EMS contains an improper access control vulnerability that may allow an unauthenticated attacker to execute unauthorized code or commands via crafted requests.
Quick answer
Fortinet FortiClient EMS should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- 7.4.5
- 7.4.6
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
Treat CVE-2026-35616 as a critical, actively exploited FortiClient EMS issue. Fortinet identifies FortiClient EMS 7.4.5 through 7.4.6 as affected by improper access control that can allow an unauthenticated attacker to execute unauthorized code or commands through crafted requests. Apply Fortinet's hotfix for the installed 7.4.x build immediately, or upgrade FortiClient EMS to 7.4.7 or later. Until remediation is complete, restrict EMS exposure to trusted networks or VPN access only and review internet-accessible EMS systems for compromise.
- Inventory every FortiClient EMS deployment, including internal, cloud-hosted, and internet-accessible management hosts.
- Identify FortiClient EMS 7.4.5 and 7.4.6 instances as affected and prioritize them for immediate remediation.
- Apply the official Fortinet hotfix for the installed 7.4.x build, or upgrade FortiClient EMS to version 7.4.7 or later.
- Restrict FortiClient EMS administrative and API access to trusted administrator networks or VPN until remediation is verified.
- Review Fortinet's PSIRT guidance and hotfix instructions for exact package and deployment requirements.
- Inspect EMS logs, web access logs, authentication logs, and EDR telemetry for crafted requests, unexpected command execution, new administrative users, or other signs of exploitation.
- Rotate EMS administrator credentials, API tokens, and related secrets if compromise is suspected.
- For FortiClient Cloud and FortiSASE, confirm the tenant/service is covered by Fortinet's managed remediation and document that no local customer patch action is required.
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Verify the fix
- Confirm the FortiClient EMS instance is upgraded to 7.4.7 or later, or that the Fortinet hotfix is installed on 7.4.5 or 7.4.6.
- Confirm EMS administrative and API endpoints are not exposed directly to the public internet unless explicitly required and protected.
- Review logs after remediation for additional exploit attempts or suspicious post-remediation activity.
- Run a Fixnx scan against public hostnames and management endpoints to verify exposure has been reduced.
- Record the CISA KEV remediation date and retain Fortinet hotfix or upgrade evidence for audit review.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-35616?
Fortinet FortiClient EMS should be checked against the vendor advisory and trusted references linked on this page.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
Why can this risk appear in multiple categories?
A vulnerability can belong to more than one platform or ecosystem. Fixnx keeps one canonical risk page while also listing it in every relevant category.