CVE-2026-4357 Embed HTML5 Game <= 1.3 - Unauthenticated Arbitrary File Upload
Unauthenticated attackers can upload PHP backdoors via the Embed HTML5 Game WordPress plugin, leading to remote code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4357?
CVE-2026-4357 is a critical vulnerability in Unknown Embed HTML5 Game, published on 2 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-434
Which versions are affected by CVE-2026-4357?
How do I fix CVE-2026-4357?
No fix has been published for CVE-2026-4357 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-4357 being exploited?
There is no known exploitation of CVE-2026-4357 in the wild and no public exploit code.
Sources
Also known as GHSA-j479-42pv-8r66.