What is CVE-2026-21743?

CVE-2026-21743 is a medium-severity vulnerability in Fortinet Fortiauthenticator, classified under Missing Authorization. CVSS score: 6.8/10. Published 2026-02-10.

How severe is CVE-2026-21743?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Auth bypass in Fortinet Fortiauthenticator

CVE-2026-21743

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 modi…

Vulnerability class: Broken Access Control

EPSS: 0.000 (6.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C.

Affected products

Fortinet Fortiauthenticator — versions 6.6.0, 6.5.0, 6.4.0

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

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

Frequently asked questions

What is CVE-2026-21743?: CVE-2026-21743 is a medium-severity vulnerability in Fortinet Fortiauthenticator, classified under Missing Authorization. CVSS score: 6.8/10. Published 2026-02-10.
How severe is CVE-2026-21743?: Medium severity. CVSS v3 base score is 6.8 out of 10.