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Exploited vulnerability · CISA KEV

Is CVE-2026-35616 exploited? Yes: in CISA KEV since 6 Apr 2026

Gociux · Fortinet FortiClient EMS · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-35616, Fortinet FortiClient EMS Improper Access Control Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 6 Apr 2026, 2 days after it was published. It affects Fortinet FortiClient EMS, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 6 Apr 2026
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.1CVSS 3.1 · critical
US federal due9 Apr 2026BOD 22-01 deadline

What it is

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

VendorFortinet (32 exploited CVEs in KEV)
ProductFortiClient EMS
VulnerabilityFortinet FortiClient EMS Improper Access Control Vulnerability
WeaknessCWE-284
Published4 Apr 2026
Added to KEV6 Apr 2026
Reported by (CNA)fortinet

What to do

  1. Check whether you run it. Look for FortiClient EMS in your asset inventory, including appliances and cloud images. Stack check lists every exploited Fortinet CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 4 Apr 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for Fortinet.

Other exploited CVEs in FortiClient EMS

References

Questions

Is CVE-2026-35616 being exploited?

Yes. CISA added CVE-2026-35616 to the Known Exploited Vulnerabilities catalog on 6 Apr 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-35616 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2026-35616?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Fortinet's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected FortiClient EMS and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in April 2026 · Fortinet scorecard · act-now radar.

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