File Upload Vulnerability in Embed HTML5 Game Plugin for WordPress
CVE-2026-4357

10CRITICAL

Key Information:

Vendor

WordPress
Status
Embed Html5 Game
Vendor
CVE Published:
2 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4357?

The Embed HTML5 Game WordPress plugin prior to version 1.3 is susceptible to a serious file upload vulnerability. This security flaw allows unauthorized users to upload arbitrary files, including PHP scripts, which can result in the injection of malicious backdoors on the server. The compromised sites can then be exploited for various malicious activities, making it essential for users to patch this vulnerability promptly.

Affected Version(s)

Embed HTML5 Game 0 <= 1.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-4357 - Proof of Concept

References

https://wpscan.com/vulnerability/b364969d-9dac-46ce-83e2-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
10
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Mike Gozdiskowski
WPScan
.