CVE-2026-11976

CriticalCVSS 10.0/10Last modified Aug 26, 2026

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.

Metrics

CVSS 3.1 10.0/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-912

Affected software

Vendor	Product	Versions
Unknown	MonsterInsights Pro	>= 10.2.0, < 11.0.0

References

https://wpscan.com/vulnerability/d1250410-b919-4a90-8cf2-04031f9e5e2b/

Timeline

Published: Aug 6, 2026
Last modified: Aug 26, 2026
NVD status: Deferred

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