CVE-2026-21743

Name: CVE-2026-21743
Creator: NVD / NIST
Published: 2026-02-10T16:16:10.903+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 0.34%

Last modified Jun 17, 2026

CVE-2026-21743 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. 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.. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.2/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.34%

25.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-862

Affected Software

Vendor	Product	Versions
Fortinet	Fortiauthenticator	>= 6.3.0, < 6.6.7

References

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

Timeline

Published: Feb 10, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-21743?

How severe is CVE-2026-21743?

CVE-2026-21743 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2026-21743?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-21743?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST