What is CVE-2026-4357?

CVE-2026-4357 is a critical-severity vulnerability in Embed Html5 Game, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 10.0/10. Published 2026-09-02.

How severe is CVE-2026-4357?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Arbitrary file upload in Embed Html5 Game

CVE-2026-4357

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.

Vulnerability class: Unrestricted File Upload

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Unknown Embed Html5 Game

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

contact@wpscan.com (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-4357?: CVE-2026-4357 is a critical-severity vulnerability in Embed Html5 Game, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 10.0/10. Published 2026-09-02.
How severe is CVE-2026-4357?: Critical severity. CVSS v3 base score is 10.0 out of 10.