CVE-2026-11976: MonsterInsights Pro (WordPress plugin) · Hidden Functionality
Affects MonsterInsights Pro (WordPress plugin)Source CVE Database V5
Not known to be exploited · CVSS 10.0 Critical : upgrade to 11.0.0 as a priority.
Data as of 5 Nov 2026, 23:24 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 44% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 11.0.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 6 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Upgrade MonsterInsights Pro (WordPress plugin) to 11.0.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| MonsterInsights Pro | Affected
| Fixed in
|
AI-suggested
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.
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.