CVE-2026-84386: unverified ownership vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.7, FortiClientWindows 7.2 all versions may allow attacker to improper access control via
CVE-2026-84386 key facts
- CISA KEV
- Not listed (catalogue checked )
- Highest advisory rating
- Medium
- CVSS base score
- 5.1 (Fortinet), 5.1 (Fortinet)
- CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H/E:P/RL:O/RC:C· base score 4.7, scored by fortinetAttack vector: local. Attack complexity: low. Privileges required: high. User interaction: none. Scope: unchanged. Confidentiality impact: none. Integrity impact: low. Availability impact: high.- Weakness
- CWE-283 Improper access control
- EPSS
- 0.14% chance of exploitation in the next 30 days (3rd percentile). FIRST EPSS, .
- CISA SSVC
- Exploitation: none observed. Automatable: no. Technical impact: partial. CISA, .
- Vendor advisories
- 2 from Fortinet
- Assigned by
- fortinet (CNA)
- CVE record published
- Listed by VulniPulse
Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-84386; each belongs to its advisory, not to every product listed. How records are collected and checked.
Description
A unverified ownership vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.7, FortiClientWindows 7.2 all versions may allow attacker to improper access control via via an exposed minifilter communication port.
Text from the CVE.org record (fortinet).
How do I fix CVE-2026-84386?
- Upgrade to FortiClientWindows version 8.0.0 or above Upgrade to FortiClientWindows version 7.4.8 or above (CVE.org record)
Vendor advisories for CVE-2026-84386
Fortinet
2 advisories- Advisory severityMedium5.1
Medium [CVE-2026-84386] unverified ownership vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.7, FortiClientWindows 7.2 all versions may allow attacker to improper access control via <insert attack vector here>
CVE-2026-84386Source published Source updated
A unverified ownership vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.7, FortiClientWindows 7.2 all versions may allow attacker to improper access control
- Affected products in this advisory
- FortiClientWindows
- Source-reported affected versions
- FortiClientWindows: 7.2.0 through 7.4.7 (vendor-listed versions)
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- No mitigation guidance extracted; consult the source.
- Advisory severityMedium5.1
Medium [CVE-2026-84386] Arbitrary process termination from exposed minifilter communication port
FG-IR-26-165Source published Source updated
CVSSv3 Score: 5.1 An Unverified Ownership Vulnerability [CWE-283] in FortiClient Windows fortimon3 driver may allow an authenticated attacker to terminate arbitrary processes via an exposed minifilter communication port. Revised on 2026-09-08 00:00:00
- Affected products in this advisory
- FortiClientWindows
- Source-reported affected versions
- FortiClientWindows: 7.2.0 through 7.4.7 (vendor-listed versions)
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- No mitigation guidance extracted; consult the source.
References
Timeline
- CVE record published
- First vendor advisory listed by VulniPulse
- CVE record last updated
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