CVE-2026-4357CWE-434unrestricted-file-upload

CVE-2026-4357

Critical · published September 2, 2026

CVSS v3.1
10.0
EPSS
1%
Percentile
45.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
10.0 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00545 · 45.0th percentile
Weakness
CWE-434 · Unrestricted Upload of File with Dangerous Type
Published
2026-09-02T19:17Z
References (1)
https://wpscan.com/vulnerability/b364969d-9dac-46ce-83e2-fc0fc2e5f698/ · [email protected]
EPSS history
Timeline
  • 04 SEP 03:42Z
    EPSS moved — → 0%
    epss
  • 02 SEP 14:16Z
    Embed HTML5 Game <= 1.3 - Unauthenticated Arbitrary File Upload
    cvelistv5