MonsterInsights Pro 10.2.0/10.2.2 - Backdoored via AWS S3 bucket compromise
45Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 10
exploitation probability
—
observed exploitation
nono source reports it
1 public exploit(s)
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected products
Unknown · MonsterInsights Propublic PoCs found — 1
cve_referencewpscan.com/vulnerability/d1250410-b919-4a90-8cf2-04031f9e5e2b/unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.