Emby Server - Authentication Bypass (CVE-2023-33193)

CVE-2023-33193 is a critical authentication bypass vulnerability in Emby Server that could allow attackers to gain administrative access by spoofing headers, particularly when the server is publicly accessible and account login configurations are not properly secured. Exploiting this flaw may enable unauthorized users to log in without a password or enumerate user accounts, posing a significant risk of unauthorized control and data exposure.

CrowdSec has been tracking this vulnerability and its exploits since 14th of January 2026.

Data from the CrowdSec community indicates that exploitation of CVE-2023-33193 is highly selective and intelligence-driven. Threat actors use advanced reconnaissance and carefully choose their targets, often as part of sophisticated campaigns or advanced persistent threat operations. CrowdSec network telemetry also shows that exploitation of CVE-2023-33193 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.

Attackers exploit this vulnerability by sending requests to /emby/users/public with the X-Forwarded-For: 127.0.0.1 header, allowing them to bypass authentication and enumerate user accounts or gain administrative access.