CVE-2026-11976: CWE-912 Hidden Functionality in MonsterInsights Pro
The MonsterInsights Pro update distribution S3 bucket was compromised, allowing an attacker to insert a malicious file into versions 10.2.0 and 10.2.2 of the software. The malicious file, class-system-check.php, was found in three variants sharing the same encryption key, indicating a single threat actor with ongoing access. This vulnerability is classified as CWE-912 (Hidden Functionality) and has a critical CVSS score of 10. The attacker retains write access to the update distribution bucket, posing a severe risk of supply chain compromise. The product is a cloud service, and a patch is available.
AI Analysis
Technical Summary
CVE-2026-11976 describes a critical supply chain compromise of the MonsterInsights Pro update distribution bucket hosted on AWS S3. The attacker gained write access to the bucket, injecting a malicious PHP file (class-system-check.php) into the official releases 10.2.0 and 10.2.2. Three variants of the malicious payload were observed on 2026-06-11, all using the same AES-256-GCM key, confirming a single threat actor. This hidden functionality (CWE-912) allows the attacker to potentially execute arbitrary code or perform unauthorized actions via the compromised update mechanism. The vulnerability affects the cloud-hosted update service, and a patch or mitigation is available.
Potential Impact
The compromise of the official update distribution bucket allows an attacker to deliver malicious code to users updating MonsterInsights Pro versions 10.2.0 and 10.2.2. This can lead to complete system compromise, data theft, or persistent backdoors due to the critical severity and full confidentiality, integrity, and availability impact (CVSS 10). The attacker’s continued write access to the bucket indicates ongoing risk until remediation is applied.
Mitigation Recommendations
A patch is available for this vulnerability. Since MonsterInsights Pro update distribution is a cloud-hosted service, the vendor manages remediation server-side. Users should verify that they are receiving updates from a trusted source and consult the vendor advisory for confirmation of patch deployment and further guidance. Immediate update to a patched version or vendor-provided fix is recommended.
CVE-2026-11976: CWE-912 Hidden Functionality in MonsterInsights Pro
Description
The MonsterInsights Pro update distribution S3 bucket was compromised, allowing an attacker to insert a malicious file into versions 10.2.0 and 10.2.2 of the software. The malicious file, class-system-check.php, was found in three variants sharing the same encryption key, indicating a single threat actor with ongoing access. This vulnerability is classified as CWE-912 (Hidden Functionality) and has a critical CVSS score of 10. The attacker retains write access to the update distribution bucket, posing a severe risk of supply chain compromise. The product is a cloud service, and a patch is available.
CVSS v3.1
Score 10.0critical
Affected software
MonsterInsights Pro
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-11976 describes a critical supply chain compromise of the MonsterInsights Pro update distribution bucket hosted on AWS S3. The attacker gained write access to the bucket, injecting a malicious PHP file (class-system-check.php) into the official releases 10.2.0 and 10.2.2. Three variants of the malicious payload were observed on 2026-06-11, all using the same AES-256-GCM key, confirming a single threat actor. This hidden functionality (CWE-912) allows the attacker to potentially execute arbitrary code or perform unauthorized actions via the compromised update mechanism. The vulnerability affects the cloud-hosted update service, and a patch or mitigation is available.
Potential Impact
The compromise of the official update distribution bucket allows an attacker to deliver malicious code to users updating MonsterInsights Pro versions 10.2.0 and 10.2.2. This can lead to complete system compromise, data theft, or persistent backdoors due to the critical severity and full confidentiality, integrity, and availability impact (CVSS 10). The attacker’s continued write access to the bucket indicates ongoing risk until remediation is applied.
Mitigation Recommendations
A patch is available for this vulnerability. Since MonsterInsights Pro update distribution is a cloud-hosted service, the vendor manages remediation server-side. Users should verify that they are receiving updates from a trusted source and consult the vendor advisory for confirmation of patch deployment and further guidance. Immediate update to a patched version or vendor-provided fix is recommended.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-06-11T12:56:22.681Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Is Cloud Service
- true
Threat ID: 6a7506f3bf8831d5395f53f3
Added to database: 08/06/2026, 22:13:07 UTC
Last enriched: 08/14/2026, 16:19:33 UTC
Last updated: 09/21/2026, 22:01:32 UTC
Views: 50
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