EIBIZ i-Media Server Digital Signage 3.8.0 Unauthenticated User Creation Vulnerability

Advisories

severity: critical
date: December 10, 2025
Affecting: i-Media Server Digital Signage <= 3.8.0
CVE: CVE-2020-36894
CWE: CWE-306 Missing Authentication for Critical Function
CVSS: 9.3
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References: ExploitDB-48763
Zero Science Lab Disclosure (ZSL-2020-5586)
EIBIZ Homepage
Credit: LiquidWorm as Gjoko Krstic of Zero Science Lab
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.