CVE-2026-11976
MonsterInsights Pro 10.2.0/10.2.2 - Backdoored via AWS S3 bucket compromise
CRITICAL 10.0EPSS 0.5%
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.
- Affected
- MonsterInsights Pro
- CVSS v3.1 WPSCAN
- 10.0 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - EPSS
- 0.52% chance of exploitation in the next 30 days, 43rd percentile
- Published
- 2026-08-06
- Updated
- 2026-08-07