CVEvulnerability

CVE-2026-11976

10.0 CRITICAL Published 2026-08-06 Modified 2026-08-26 Official page ↗
Status
Deferred
Published
2026-08-06
Last modified
2026-08-26
Assigner
[email protected]
CVSS 3.1 ([email protected])
10.0 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weaknesses
CWE-912

Description

The official MonsterInsights Pro update distribution bucket (`monster-insights.s3.amazonaws.com`) was compromised. Both the current release (10.2.2) and the version MonsterInsights rolled back to (10.2.0) contain a malicious file, `class-system-check.php`. Three distinct variants were observed on 2026-06-11, all sharing the same AES-256-GCM key, confirming a single threat actor. The attacker retains write access to the S3 bucket and has been actively iterating on the payload throughout the day.

Related

Weakness · CWE (1)

  • CWE-912 Hidden Functionality weakness

References