EUVD-2026-54300
GHSA-w2mq-7hp5-vcv5
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Trojaned code is delivered over the network via the trusted update channel but is pulled by an admin action (UI:R); it runs with full host privileges beyond the plugin, so S:C and C/I/A:H.
Primary rating from Vendor (wpscan).
CVSS VectorVendor: wpscan
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Supply-chain compromise of MonsterInsights Pro, a widely used WordPress Google Analytics plugin, delivered a malicious file (class-system-check.php) through the vendor's own S3 update bucket (monster-insights.s3.amazonaws.com). Both the current release (10.2.2) and the 10.2.0 build the vendor rolled back to are trojaned, so administrators who updated - or downgraded to remediate - received attacker-controlled PHP that runs with full site privileges. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the site run MonsterInsights Pro and obtain the plugin artifact from the compromised official channel (monster-insights.s3.amazonaws.com) at or after the 2026-06-11 compromise - specifically versions 10.2.2 or 10.2.0. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine top-priority incident rather than an inflated high-CVSS score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No independently confirmed clean fix version is available in the provided data - do not simply 'update to latest', because both 10.2.2 and the 10.2.0 rollback are trojaned. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and audit all WordPress installations running MonsterInsights Pro, immediately disable and remove the plugin, and begin forensic review for indicators of compromise including unexpected file modifications, suspicious database queries, and anomalous network traffic. …
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External POC / Exploit Code
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