Compromised Update Distribution for MonsterInsights Pro by MonsterInsights
CVE-2026-11976

10CRITICAL

Key Information:

Vendor

MonsterInsights

Status
Monsterinsights Pro
Vendor
CVE Published:
6 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-11976?

The update distribution for MonsterInsights Pro was compromised, involving the presence of a malicious file named 'class-system-check.php' in both version 10.2.2 and the rolled-back version 10.2.0. This breach occurred through the official update bucket hosted on an Amazon S3 server. A single attacker was confirmed to have write access to the bucket and has released multiple variants of the malicious payload, utilizing the same AES-256-GCM key. This situation represents a significant risk for users relying on these versions, highlighting the need for immediate awareness and action.

Affected Version(s)

MonsterInsights Pro 10.2.0 < 11.0.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-11976 - Proof of Concept

References

https://wpscan.com/vulnerability/d1250410-b919-4a90-8cf2-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
10
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Mike Gozdiskowski
WPScan
.