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Vulnerability record · CVE-2026-11976 · published 6 August 2026

CVE-2026-11976: The official MonsterInsights Pro update distribution bucket (`monster-insights.s3.amazonaws.com`) was compromi…

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.

10.0 CVSS 3.1 Critical EPSS 0.52% · top 58.0% CWE-912 · CWE-912 Deferred
10.0CVSS 3.1 base score
0.52%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
26 Aug 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References

LinkTags
https://wpscan.com/vulnerability/d1250410-b919-4a90-8cf2-04031f9e5e2b/

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Source: NIST National Vulnerability Database (record CVE-2026-11976), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.