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VulnerabilityPublished

CVE-2026-11976: MonsterInsights Pro (WordPress plugin) · Hidden Functionality

Affects MonsterInsights Pro (WordPress plugin)Source CVE Database V5

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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

CVSS 3.1 base score
10.0Critical
How severe the flaw is on the 0–10 CVSS scale.
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:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
MonsterInsights ProAffected
  • >=10.2.0 <11.0.0
Fixed in
  • 11.0.0

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.

References

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