Critical vulnerabilities in Fortinet FortiSandbox under active exploitation

Source:Heise Online

02 — Who / Subject

Fortinet, DefusedCyber

03 — Where / Locus

Global

04 — When / Temporality

June 14, 2026

Verified: June 17, 2026

05 — Why / Core Summary

"Fortinet's FortiSandbox is currently being targeted by attackers exploiting three critical vulnerabilities. The vulnerabilities (CVE-2026-39813, CVE-2026-39808, CVE-2026-25089) allow for authentication bypass and unauthorized command execution. Security researchers observed attacks starting June 14, 2026."

Conflict Analysis

The report highlights active exploitation of critical vulnerabilities in enterprise security appliances, posing a significant risk to network infrastructure.

Recommended Background Resource

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The Art of Memory Forensics: Detecting Malware and Threats in Windows, Linux, and Mac Memory

Author: Michael Hale Ligh, Andrew Case, Jamie Levy, AAron Walters

This book provides a deep technical understanding of how sophisticated malware exploits system vulnerabilities and evades detection, which is essential for grasping the mechanics behind sandbox-related exploits.

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