MonsterInsights Pro 10.2.0/10.2.2 - Backdoored via AWS S3 bucket compromise
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | MonsterInsights Pro | 10.2.0 to before 11.0.0 | 11.0.0 | Patch available | CNA |
- MonsterInsights Pro VendorUnknown Affected 10.2.0 to before 11.0.0 Fixed in 11.0.0 Patch available CNA
Remediation
- Fix · CNA MonsterInsights Pro (Unknown) Fixed in 11.0.0
Timeline
- 2026-10-02 Threatist record created from CVE-2026-11976
- 2026-10-03 Alias added: GHSA-w2mq-7hp5-vcv5
References
Sources
- CVE-2026-11976 · CVE Program
- CVE-2026-11976 · NVD
- FIRST EPSS
- GHSA-w2mq-7hp5-vcv5 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences