CVE-2026-21743
Missing Authorization in FortiAuthenticator Allows Unauthorized User Modification
Publication date: 2026-02-10
Last updated on: 2026-02-12
Assigner: Fortinet, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| fortinet | fortiauthenticator | From 6.3.0 (inc) to 6.6.7 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-862 | The product does not perform an authorization check when an actor attempts to access a resource or perform an action. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a missing authorization issue in Fortinet FortiAuthenticator versions 6.3 through 6.6.6. It allows a user with read-only permissions to bypass restrictions and modify local user accounts by uploading a file to an unprotected endpoint.
How can this vulnerability impact me? :
The vulnerability can lead to unauthorized modifications of local user accounts, potentially compromising the integrity and security of the authentication system. This could allow attackers or unauthorized users to escalate privileges or disrupt normal operations.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know