【Vulnerability Alert】FortiMonitorOnSight Contains a Critical Cybersecurity Vulnerability (CVE-2026-84390)

publish date : 2026-09-30 update date : 2026-10-02

Source: Ministry of education information & communication security contingency platform

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Publication Number TACERT-ANA-2026091401090404 Publication Time 2026-09-14 13:46:05
Incident Type ANA-Vulnerability Alert Discovery Time 2026-09-14 13:46:05
Impact Level Low  
[Subject]
【Vulnerability Alert】FortiMonitorOnSight Contains a Critical Cybersecurity Vulnerability (CVE-2026-84390)
[Content]

Forwarded from TWCERTCC Cybersecurity Alert TWCERTCC-200-202609-00000014

The FortiMonitorOnSight web portal contains a Source Code Containing Sensitive Information vulnerability (CVE-2026-84390, CVSS: 9.6). This vulnerability may allow an unauthenticated remote attacker to bypass authentication by forging or reusing a JWT.

Information Sharing Level: WHITE (the intelligence content is information that may be publicly disclosed)

[Affected Platform]

FortiMonitorOnSight versions 7.2.0 to 7.2.2
FortiMonitorOnSight versions 7.2.4 to 7.2.7

[Recommended Actions]

Please update to the following version: FortiMonitorOnSight version 7.2.8 or later

[Reference]

https://www.twcert.org.tw/tw/cp-169-11196-1a15a-1.html

(This notification is for informational purposes only and does not constitute a cybersecurity incident).
If you have questions or suggestions regarding this notification, please feel free to contact us.
Ministry of education information & communication security contingency platform
Website: https://info.cert.tanet.edu.tw/
Phone: +886-7-5250211
Internet Phone: 98400000
E-Mail: service@cert.tanet.edu.tw
Organizer: Computer Center