CVE-2026-84390 , Fortinet FortiMonitor OnSight Information Disclosure Vulnerability
A NVD · · CVE-2026-84390
Admiralty grading (A–F · 1–6)
Source reliability
- A Completely reliable
- B Usually reliable
- C Fairly reliable
- D Not usually reliable
- E Unreliable
- F Cannot be judged
Information credibility
- 1 Confirmed
- 2 Probably true
- 3 Possibly true
- 4 Doubtful
- 5 Improbable
- 6 Cannot be judged
NATO Admiralty (AJP-2.1) grades confidence, independent of the risk score. Cross-source corroboration isn't tracked for non-CVE news, so single-source items are capped at a lower credibility number; a low number does not imply low quality.
Key metrics
- CVSS
- 9.8
- EPSS
- 0%
Key insight
Sensitive information hardcoded in source code allows unauthorized access to FortiMonitor instances; vague attack vector details suggest incomplete CVE documentation.
Description
CVE-2026-84390 affects Fortinet FortiMonitor OnSight versions 7.2.0,7.2.7 and is a sensitive information disclosure vulnerability in source code that enables attackers to achieve unauthorized access via improper access control. The NVD documentation is incomplete (attack vector contains a placeholder), indicating ongoing or not-yet-finalized CVE analysis. Fortinet has likely already released or will release updates shortly. Active exploitation status in the wild cannot be determined from available information.
Risk score
- cvss base
- 98.00
- kev bonus
- 0.00
- epss bonus
- 0.00
- poc bonus
- 0.00
- raw before weight
- 98.00
- industry weight
- 1.21
- freshness factor
- 1.00
- exploitability factor
- 1.00
- days old
- 0.00
- vendor mismatch penalty
- 0.00
Path: operational