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.
Published: 2026-09-02
Score: 10 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The Embed HTML5 Game WordPress plugin through version 1.3 fails to restrict file uploads or enforce file type validation. This allows an unauthenticated user to upload PHP files to the site, effectively giving the attacker a backdoor that can be executed as server code. The weakness is a classic improperly validated input flaw (CWE-434).

Affected Systems

Any WordPress installation running Embed HTML5 Game version 1.3 or earlier is susceptible. The vulnerability applies to all users of the plugin regardless of role because there is no authentication or permission check for uploads.

Risk and Exploitability

The CVSS score of 10 classifies this as a critical issue, and the lack of an authentication barrier means any visitor can perpetrate the upload. Although EPSS data is unavailable, the ease of exploitation and the immediate remote code execution potential make the threat high. The vulnerability is not yet listed as a known exploited vulnerability in the CISA KEV catalog, but the severity warrants urgent attention.

Generated by OpenCVE AI on September 3, 2026 at 11:58 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Remove or deactivate the Embed HTML5 Game plugin or upgrade to a patched version if one is released.
  • Configure the web server or .htaccess to block execution of uploaded PHP files in the plugin’s upload directory.
  • Continuously monitor server logs for unauthorized file uploads or execution attempts to detect any exploitation early.

Generated by OpenCVE AI on September 3, 2026 at 11:58 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Wed, 02 Sep 2026 10:45:00 +0000

Type Values Removed Values Added
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.
Title Embed HTML5 Game <= 1.3 - Unauthenticated Arbitrary File Upload
Weaknesses CWE-434
References
Metrics cvssV3_1

{'score': 10, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: WPScan

Published:

Updated: 2026-09-02T14:57:37.949Z

Reserved: 2026-03-17T18:48:12.269Z

Link: CVE-2026-4357

cve-icon Vulnrichment

Updated: 2026-09-02T14:44:13.696Z

cve-icon NVD

Status : Deferred

Published: 2026-09-02T15:17:38.413

Modified: 2026-09-03T17:50:37.690

Link: CVE-2026-4357

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-03T12:00:04Z

Weaknesses
  • CWE-434

    Unrestricted Upload of File with Dangerous Type