CVE-2026-4357
Received Received - Intake

Unauthenticated File Upload in Embed HTML5 Game WordPress Plugin

Publication date: 2026-09-02

Last updated on: 2026-09-02

Assigner: WPScan

Description
The Embed HTML5 Game WordPress plugin through 1.3 does not properly restrict who can upload files via the plugin, as well as what can be uploaded, making it possible for unauthenticated attackers to upload PHP backdoors on affected sites.

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Meta Information

Published
2026-09-02
Last Modified
2026-09-02
Generated
2026-09-02
AI Q&A
2026-09-02
EPSS Evaluated
N/A
NVD
CVE-2026-4357
EUVD
EUVD-2026-70038

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
embed_html5_game wordpress_plugin to 1.3 (inc)
embed_html5_game embed_html5_game to 1.3 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-434 The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.

Attack-Flow Graph

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Executive Summary

CVE-2026-4357 is an unauthenticated arbitrary file upload vulnerability in the WordPress plugin Embed HTML5 Game version 1.3 or below. It allows attackers to upload malicious PHP files without authentication, potentially leading to backdoor execution on affected websites.

Detection Guidance

Check if the Embed HTML5 Game WordPress plugin version 1.3 or below is installed. Look for unexpected PHP files in the plugin's upload directories or web root. Review server logs for unauthorized file upload attempts or POST requests to /wp-content/plugins/embed-html5-game/.

Impact Analysis

This vulnerability allows unauthenticated attackers to upload PHP backdoors to your website. This could result in complete control over your site, data theft, malware distribution, or defacement. Attackers can execute arbitrary code on your server without needing any user credentials.

Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, violating GDPR and HIPAA requirements for data protection and access control. Organizations may face fines, legal action, and reputational damage if exploited.

Mitigation Strategies

Immediately disable and remove the Embed HTML5 Game plugin if installed. Restrict file upload permissions in WordPress and web server configurations. Monitor for signs of compromise like unexpected PHP files or backdoor activity.

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