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CVE-2026-21743: Missing authorization in FortiAuthenticator
A missing authorization vulnerability in Fortinet FortiAuthenticator 6.6.0 through 6.6.6, FortiAuthenticator 6.5 all versions, FortiAuthenticator 6.4 all versions, FortiAuthenticator 6.3 all versions may allow a read-only user to make modification to local users via a file upload to an unprotected endpoint.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| FortiAuthenticator 6.6.0 to 6.6.6 | 6.6.7 or later |
| FortiAuthenticator 6.5.0 to 6.5.7 | Upgrade past 6.5.7; see the advisory |
| FortiAuthenticator 6.4.0 to 6.4.11 | Upgrade past 6.4.11; see the advisory |
| FortiAuthenticator 6.3.0 to 6.3.5 | Upgrade past 6.3.5; see the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A missing authorization vulnerability in Fortinet FortiAuthenticator 6.6.0 through 6.6.6, FortiAuthenticator 6.5 all versions, FortiAuthenticator 6.4 all versions, FortiAuthenticator 6.3 all versions may allow a read-only user to make modification to local users via a file upload to an unprotected endpoint.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 10 Oct 2026.