CyberSecBulletin
CVE-2026-84390NVD status: Awaiting Analysis

FortiMonitorOnSight: Inclusion of Sensitive Information in Source Code

Published Updated By the CyberSecBulletin desk

CVE-2026-84390 is a critical-severity inclusion of sensitive information in source code vulnerability in FortiMonitorOnSight from Fortinet, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected FortiMonitorOnSight versions: 7.2.4 through 7.2.7; 7.2.0 through 7.2.2. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.52% chance of exploitation within 30 days, which is low compared with other CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Check which version of FortiMonitorOnSight you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on fortiguard.fortinet.com for workarounds and exact fixed builds.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
FortinetFortiMonitorOnSight7.2.4 through 7.2.7; 7.2.0 through 7.2.2Not stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (fortinet.com).

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>

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Inclusion of Sensitive Information in Source Code

The product (such as a web server or repository) provides access to source code is not intended to be accessible to users but contains sensitive information.

How developers prevent this class of flaw

  • Recommendations include removing the script from the web server and moving it to a location not accessible from the Internet.

More Inclusion of Sensitive Information in Source Code vulnerabilities (CWE-540)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).

References

Recent Inclusion of Sensitive Information in Source Code vulnerabilities

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