CVE-2026-35616 Details.
FortiClient EMS - Authentication Bypass
Atlas does not check this one. Needs requests that change data.
To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check.
About CVE-2026-35616. What It Means.
Detects whether Fortinet hotfix FG-IR-26-099 for CVE-2026-35616 is missing by comparing behavioral responses from a certificate-authenticated endpoint. The template sends X-SSL-CLIENT-VERIFY: SUCCESS without certificate material and checks whether this spoofed header changes server behavior.
Affected Product. What Is Hit.
- Vendor
- fortinet
- Product
- Fortinet FortiClient EMS
FAQ
Common Questions.
FortiClient EMS - Authentication Bypass. Detects whether Fortinet hotfix FG-IR-26-099 for CVE-2026-35616 is missing by comparing behavioral responses from a certificate-authenticated endpoint. The template sends X-SSL-CLIENT-VERIFY: SUCCESS without certificate material and checks whether this spoofed header changes server behavior.
No. To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check. The facts about CVE-2026-35616 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
Yes. CVE-2026-35616 is on the CISA Known Exploited Vulnerabilities list, which means attackers have used it against real targets.
Update Fortinet FortiClient EMS to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-35616. Atlas does not run a check for it, so nothing here says whether a particular site is affected.