Critical [CVE-2026-84390] JWT used for authentication in web GUI signed with static key
This critical-severity Fortinet advisory covers CVE-2026-84390 affecting FortiMonitorOnSight.
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Summary
CVSSv3 Score:
9.6
An Inclusion of Sensitive Information in Source Code vulnerability [CWE-540] in FortiMonitorOnSight web portal may allow a remote unauthenticated attacker to bypass authentication via forged or reused JWT
Revised on 2026-09-08 00:00:00
- FortiMonitorOnSight FortiMonitorOnSight: 7.2 through 7.2 (vendor-listed versions)
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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