CVE-2026-84386: Improper access control in Fortinet FortiClientWindows
Description
CVE-2026-84386 is an improper access control vulnerability in Fortinet FortiClientWindows versions 7.4.0 through 7.4.7 and all versions of 7.2.x up to 7.2.15. It involves an unverified ownership issue via an exposed minifilter communication port, potentially allowing attackers with high privileges to gain improper access. The vulnerability has a medium severity rating and an official fix is available.
CVSS v3.1
Score 4.7medium
Affected software
Fortinet
FortiClientWindows
cpe:2.3:a:fortinet:forticlientwindows:7.4.7:*:*:*:*:*:*:*cpe:2.3:a:fortinet:forticlientwindows:7.4.6:*:*:*:*:*:*:*cpe:2.3:a:fortinet:forticlientwindows:7.4.5:*:*:*:*:*:*:*cpe:2.3:a:fortinet:forticlientwindows:7.4.4:*:*:*:*:*:*:*cpe:2.3:a:fortinet:forticlientwindows:7.4.3:*:*:*:*:*:*:*cpe:2.3:a:fortinet:forticlientwindows:7.4.2:*:*:*:*:*:*:*AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Fortinet FortiClientWindows affects versions 7.4.0 to 7.4.7 and 7.2.0 to 7.2.15. It is caused by improper access control due to an unverified ownership condition on an exposed minifilter communication port. An attacker with high privileges could exploit this to perform unauthorized actions. The CVSS 3.1 base score is 4.7, indicating medium severity. The vendor has released an official fix to address this issue.
Potential Impact
The vulnerability allows an attacker with high privileges to bypass proper access controls via the exposed minifilter communication port, potentially leading to integrity loss and high availability impact. Confidentiality impact is not present. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Fortinet for affected versions. Users should apply the vendor-provided patches to remediate this vulnerability. Since the vulnerability is patched, no additional mitigation steps are required beyond updating to fixed versions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- fortinet
- Date Reserved
- 2026-09-01T16:36:06.039Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
Threat ID: 6aa03d69acd9273b49f0b400
Added to database: 09/08/2026, 16:52:57 UTC
Last enriched: 10/09/2026, 22:10:26 UTC
Last updated: 10/22/2026, 13:15:24 UTC
Views: 114
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