CVE-2026-4357 | BDVDB-2026-367242 Detail

Embed HTML5 Game

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.

Weaknesses#

CWE-434 Unrestricted Upload of File with Dangerous Type

References#

https://wpscan.com/vulnerability/b364969d-9dac-46ce-83e2-fc0fc2e5f698/

Exploit#

https://wpscan.com/vulnerability/b364969d-9dac-46ce-83e2-fc0fc2e5f698/

History#

Version 12026-09-02Record published in the CVE List.

Published

Published: 2026-09-02
Last modified: 2026-09-02

Vendor information

Vendor: Not stated
Product: Embed HTML5 Game

Score

10.0 Critical

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 46.0.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Unrestricted File Upload

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
<= 1.3
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

10.0 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Changed
Confidentiality	High
Integrity	High
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).