Authorization Vulnerability in Fortinet FortiAuthenticator Software
CVE-2026-21743

6.8MEDIUM

Key Information:

Vendor

Fortinet
Status
Fortiauthenticator
Vendor
CVE Published:
10 February 2026

What is CVE-2026-21743?

A missing authorization vulnerability in Fortinet's FortiAuthenticator allows a read-only user to modify local user accounts through an unprotected file upload endpoint. This issue affects multiple versions of FortiAuthenticator, posing risks for unauthorized access and potential manipulation of local user settings.

Affected Version(s)

FortiAuthenticator 6.6.0 <= 6.6.6

FortiAuthenticator 6.5.0 <= 6.5.7

FortiAuthenticator 6.4.0 <= 6.4.11

References

https://fortiguard.fortinet.com/psirt/FG-IR-25-528

CVSS V3.1

Score:
6.8
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.