What is CVE-2026-84390?

CVE-2026-84390 is a critical-severity vulnerability in Fortinet Fortimonitoronsight, classified under CWE-540. CVSS score: 9.8/10. Published 2026-09-11.

How severe is CVE-2026-84390?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Fortinet Fortimonitoronsight

CVE-2026-84390

A inclusion of sensitive information in source code vulnerability in Fortinet FortiMonitorOnSight 7.2.4 through 7.2.7, FortiMonitorOnSight 7.2.0 through 7.2.2 may allow attacker to improper access control via <insert attack vector here>

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Fortinet Fortimonitoronsight

Weakness classification (CWE)

CWE-540

References

psirt@fortinet.com

Frequently asked questions

What is CVE-2026-84390?: CVE-2026-84390 is a critical-severity vulnerability in Fortinet Fortimonitoronsight, classified under CWE-540. CVSS score: 9.8/10. Published 2026-09-11.
How severe is CVE-2026-84390?: Critical severity. CVSS v3 base score is 9.8 out of 10.