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.

Project Subscriptions

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Advisories

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Fixes

Solution

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Workaround

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History

Fri, 07 Aug 2026 14:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-912
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 07 Aug 2026 02:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-730

Thu, 06 Aug 2026 22:15:00 +0000

Type Values Removed Values Added
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.
Title MonsterInsights Pro 10.2.0/10.2.2 - Backdoored via AWS S3 bucket compromise
References
Metrics cvssV3_1

{'score': 10, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: WPScan

Published:

Updated: 2026-08-07T13:47:29.290Z

Reserved: 2026-06-11T12:56:22.681Z

Link: CVE-2026-11976

cve-icon Vulnrichment

Updated: 2026-08-07T13:47:15.354Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-07T01:45:05Z

Weaknesses