CVE-2026-11976
MonsterInsights Pro 10.2.0/10.2.2 - Backdoored via AWS S3 bucket compromise
- State
- Published
- Severity
- 10.0 Critical
- Published
- Aug 6, 2026
- Updated
- Aug 7, 2026
- Reserved
- Jun 11, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 10.0 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H | WPScan |
Weaknesses
- CWE-912 Hidden Functionality
Affected Products
| Product | Versions |
|---|---|
MonsterInsights ProUnknown |
|
References
- https://wpscan.com/vulnerability/d1250410-b919-4a90-8cf2-04031f9e5e2b/exploitvdb-entrytechnical-description
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