CVE-2026-11976 MonsterInsights Pro 10.2.0/10.2.2 - Backdoored via AWS S3 bucket compromise
Attackers compromised the official update distribution bucket to inject malicious code into MonsterInsights Pro, enabling remote code execution on affected sites.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-11976?
CVE-2026-11976 is a critical vulnerability in Unknown MonsterInsights Pro, published on 6 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-912
Which versions are affected by CVE-2026-11976?
How do I fix CVE-2026-11976?
No fix has been published for CVE-2026-11976 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-11976 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-11976 exists.
Sources
Also known as GHSA-w2mq-7hp5-vcv5.