【Vulnerability Alert】A Critical Security Vulnerability Has Been Identified in the Fortinet FortiSandbox JRPC API (CVE-2026-39813)

publish date : 2026-04-17 update date : 2026-04-16

Source: Ministry of education information & communication security contingency platform

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Publication Number	TACERT-ANA-2026041504041818	Publication Time	2026/04/15 16:24
Incident Type	ANA-Vulnerability Alert	Discovery Time	2026/04/15 16:24
Impact Level	Low
[Subject] 【Vulnerability Alert】A Critical Security Vulnerability Has Been Identified in the Fortinet FortiSandbox JRPC API (CVE-2026-39813)
[Content] Forwarded from TWCERTCC-200-202604-00000012 Fortinet has disclosed a critical security vulnerability in the FortiSandbox JRPC API (CVE-2026-39813, CVSS: 9.8). This is a path traversal vulnerability that may allow an unauthenticated attacker to bypass authentication through specially crafted HTTP requests. (Information Sharing Level: WHITE (Information content can be publicly disclosed)
[Affected Platform] FortiSandbox versions 4.4.0 through 4.4.8 inclusive FortiSandbox versions 5.0.0 through 5.0.5 inclusive
[Recommended Actions] Please update to the following versions: FortiSandbox version 4.4.9 or later, and FortiSandbox version 5.0.6 or later.
[Reference] https://wwwtwcert.org.tw/tw/cp-169-10838-99d85-1.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

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