Vulnerability details
CVE-2026-11976
MonsterInsights Pro
MonsterInsights Pro 10.2.0/10.2.2 - Backdoored via AWS S3 bucket compromise
CVSS 3.1
10.0Critical
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 10.0Critical | 3.1 | CVEProject cvelistV5 (CNA) (WPScan) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| — | MonsterInsights Pro | 10.2.0 ≤ v < 11.0.0 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://wpscan.com/vulnerability/d1250410-b919-4a90-8cf2-04031f9e5e2b/ exploitvdb-entrytechnical-description
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Details
- Published
- 2026-08-06
- Last updated
- 2026-08-07
- State
- Published
- Assigner (CNA)
- WPScan
Exploit prediction (EPSS)
0.52%
Probability of exploitation in 30 days
44.5%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-912Hidden Functionality