CVE-2026-4357— Embed HTML5 Game <= 1.3 - Unauthenticated Arbitrary File Upload
Quick assessment
Affected
Unknown Embed HTML5 Game
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
WordPress 插件“Embed HTML5 Game”在 1.3 及更早版本中，未严格限制哪些用户可以上传文件，也未对可上传的文件类型进行充分限制，导致未认证的攻击者可以在受影响的站点上传 PHP 后门文件。
Possible ATT&CK Techniques 3 AI
T1083 · File and Directory Discovery T1190 · Exploit Public-Facing Application T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-4357
Vulnerability Information
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Vulnerability Title
Embed HTML5 Game <= 1.3 - Unauthenticated Arbitrary File Upload
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Unknown | Embed HTML5 Game | 0 ~ 1.3 | - |
|
II. Public POCs for CVE-2026-4357
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-4357 (1)
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Embed HTML5 Game <= 1.3 – Unauthenticated Arbitrary File Upload | CVE 2026-4357 | Plugin Vulnerabilities exploit vdb-entry technical-description
Same Patch Batch · Unknown · 2026-09-02 · 66 CVEs total
| CVE-2026-77009 | 9.9 CRITICAL | WatchMan-Site7 3.1.1 - 4.2.0 - Subscriber+ RCE via Debug Console |
| CVE-2025-9314 | 9.8 CRITICAL | Developer Tools <= 1.1.3 – Unauthenticated Arbitrary File Upload |
| CVE-2025-15485 | 8.2 HIGH | Auto x LINE <= 1.0.0 – Unauthenticated REST API Endpoints Call |
| CVE-2026-82884 | 6.8 MEDIUM | All in One SEO < 5.0.0.1 - Contributor+ Stored XSS via ai-assistant Block |
| CVE-2026-83547 | 6.8 MEDIUM | Xpro Elementor Addons 1.6.0 - 1.7.3 - Contributor+ Stored XSS via Multiple Widgets |
| CVE-2026-10821 | 6.6 MEDIUM | Yoast SEO Premium < 27.6.1 - Author+ Arbitrary .htaccess Directive Injection to RCE |
| CVE-2026-2688 | 6.5 MEDIUM | CM HIPAA Forms < 3.2.0 - Unauthenticated Authorization Bypass |
| CVE-2024-3773 | 5.9 MEDIUM | LiveJournal Shortcode <= 1.1.1 - Contributor+ Stored XSS via Shortcode |
| CVE-2026-2811 | 5.4 MEDIUM | Ajaxify Comments < 3.2 - Unauthenticated HTTP Header Injection |
| CVE-2026-8151 | 5.4 MEDIUM | Simple Membership MailChimp Integration < 1.9.8 - API Key Update via CSRF |
| CVE-2026-17563 | 5.3 MEDIUM | WP User Frontend < 4.3.11 - Unauthenticated Post Creation via Subscription-Gated Form |
| CVE-2025-15490 | 5.3 MEDIUM | Passster < 4.2.26 - Global Protection Bypass |
| CVE-2025-15489 | 5.3 MEDIUM | Passster < 4.2.24 - Password Protection Bypass |
| CVE-2026-83533 | 5.3 MEDIUM | WP Express Checkout < 2.4.9 - Unauthenticated Payment Bypass via wpec_process_payment |
| CVE-2026-77794 | 5.3 MEDIUM | RegistrationMagic 6.0.0.0 - 6.0.9.8 - Unauthenticated Payment Bypass via Zero Quantity |
| CVE-2026-77793 | 5.3 MEDIUM | RegistrationMagic < 6.0.9.9 - Unauthenticated Payment Bypass via Omitted Price Field |
| CVE-2025-8945 | 5.3 MEDIUM | Wp Edit Password Protected < 1.3.5 - Protection Bypass via REST API |
| CVE-2025-15481 | 5.3 MEDIUM | Notification Bar for WordPress <= 1.1.8 – Unauthenticated Subscriber Data Disclosure |
| CVE-2026-78153 | 5.3 MEDIUM | Restrict User Access 2.6 - 2.8 - Unauthenticated Content Protection Bypass via REST API Ro |
| CVE-2026-81571 | 4.8 MEDIUM | Brave Popup Builder < 0.8.8 - Unauthenticated Arbitrary Shortcode Execution via UTM Parame |
Showing top 20 of 66 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same vendor: Unknown
-
CVE-2026-2811
Ajaxify Comments < 3.2 - Unauthenticated HTTP Header Injecti -
CVE-2025-9314
Developer Tools <= 1.1.3 – Unauthenticated Arbitrary File Up -
CVE-2025-8945
Wp Edit Password Protected < 1.3.5 - Protection Bypass via R -
CVE-2025-15490
Passster < 4.2.26 - Global Protection Bypass -
CVE-2025-15489
Passster < 4.2.24 - Password Protection Bypass
V. Comments for CVE-2026-4357
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