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Hackers now exploiting critical Fortinet FortiSIEM flaw in attacks

ID: 1de3ab35-2af6-53fd-b938-4a49a438df15

STIX ID: report--1de3ab35-2af6-53fd-b938-4a49a438df15

Feed Name: Bleeping Computer

Threat Score
88/100

Date Published: 2026-01-16

Date Updated: 2026-04-20

Author: Sergiu Gatlan

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A critical unauthenticated OS command injection in Fortinet FortiSIEM (CVE-2025-64155) allows attackers to achieve arbitrary writes and escalate to root by abusing exposed phMonitor command handlers; proof-of-concept code is public and researchers report active exploitation in the wild, Fortinet has released patches and a workaround to limit phMonitor access.

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