CVE-2026-11976Supply chain compromise in MonsterInsights Pro
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.
View on NVDAnalysis
El bucket oficial de MonsterInsights Pro fue comprometido para distribuir versiones maliciosas del plugin de WordPress que contienen puertas traseras. El atacante mantiene acceso de escritura e inyectó código para ejecución remota en las versiones 10.2.2 y 10.2.0. Si utilizas esta herramienta, revisa inmediatamente tus servidores en busca del archivo malicioso class-system-check.php.
Relevant roles
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HEPSS
No EPSS score yet (CVE may be too fresh).
Technical 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.