CVE-2026-84390 Information disclosure in FortiMonitorOnSight
An attacker can access sensitive information included in the source code of FortiMonitorOnSight, leading to potential data exposure.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84390?
CVE-2026-84390 is a critical vulnerability in Fortinet FortiMonitorOnSight, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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>
Weakness: CWE-540
Which versions are affected by CVE-2026-84390?
How do I fix CVE-2026-84390?
No fix has been published for CVE-2026-84390 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-84390 being exploited?
There is no known exploitation of CVE-2026-84390 in the wild and no public exploit code.
Sources
Also known as GHSA-g584-wqjw-m2r8.