Skip to content
VulniPulse
Sign in
Critical9.8Fortinet

CVE-2026-84390: Fortinet JWT used for authentication in web GUI signed with static key

This Fortinet advisory covers CVE-2026-84390 in FortiMonitorOnSight.

Open the Fortinet advisory

Key facts

Vendor rating
Critical, CVSS 9.8
CISA KEV
Not listed (catalogue checked )
Affected
FortiMonitorOnSight FortiMonitorOnSight: 7.2 through 7.2 (vendor-listed versions)
Advisory id
FG-IR-26-170
Source published
Source revised
Listed by VulniPulse

Compiled by VulniPulse from the linked sources. How records are collected and checked.

Affected products & platforms

FortinetUnclassified

Description

CVSSv3 Score:

9.8

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

Text from the source record.

Affected versions
  • FortiMonitorOnSight FortiMonitorOnSight: 7.2 through 7.2 (vendor-listed versions)

Official advisory · high-confidence parse· fetched ·verify at source

More Fortinet advisories

Fortinet advisories, September 2026All Fortinet advisories

Get an email when Fortinet publishes the next one.

See Fortinet's last 90 days of advisories first. Then choose one product with live alerts free for life, or a free month of real-time alerts on everything with the severity, the fixed version and the vendor's link (card needed, then US$15/month; we email you before the first charge).

Alert me about Fortinet

iPhone and Android apps · New on the App Store

Monitor future Fortinet CVEs from your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.

Download on the App StoreGet CVE alerts on AndroidSee app features