CVE-2020-36894 Eibiz i-Media Server Digital Signage 3.8.0 Unauthenticated User Creation Vulnerability

Critical 9.3 Published 10 Dec 2025 Updated 1 Oct 2026

Unauthenticated attackers can create admin users via AMF manipulation, leading to full system compromise.

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-2020-36894?

CVE-2020-36894 is a critical authentication bypass vulnerability in EIBIZ Co.,Ltd. i-Media Server Digital Signage, published on 10 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Eibiz i-Media Server Digital Signage 3.8.0 contains an authentication bypass vulnerability that allows unauthenticated attackers to create admin users through AMF-encoded object manipulation. Attackers can send crafted serialized objects to the /messagebroker/amf endpoint to create administrative users without authentication, bypassing security controls.

Weakness: CWE-306

Which versions are affected by CVE-2020-36894?

It affects 1 product.

Products include Eibiz I-Media Server Digital Signage.

How do I fix CVE-2020-36894?

No fix has been published for CVE-2020-36894 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2020-36894 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-36894 exists.

Sources

Also known as GHSA-7jj4-vc4f-6gq7.