Critical · published November 19, 2025
⚡ A crafty user could sneak in an unverified device into your Emby Server admin dashboard with a simple manipulation of the X-Emby-Client value! Think of it like a restaurant where a guest adds a fake reservation to the host's list — no one checks if it’s real, and soon there’s a potentially suspicious diner at your table! This vulnerability allows an attacker to insert a rogue device into your dashboard, which, while not leading to immediate compromise, can lead to unauthorized access and a false sense of security. In the wrong hands, this could open the door to mischief and meddling with your precious media library!
Think of it like a restaurant where a guest adds a fake reservation to the host's list — no one checks if it’s real, and soon there’s a potentially suspicious diner at your table! Prior to versions 4.8.1.0 and 4.9.0.0-beta, Emby Server improperly sanitized the X-Emby-Client value during authentication requests, allowing malicious users to manipulate device entries in the admin dashboard.
This vulnerability allows an attacker to insert a rogue device into your dashboard, which, while not leading to immediate compromise, can lead to unauthorized access and a false sense of security. In the wrong hands, this could open the door to mischief and meddling with your precious media library! Update your Emby Server to version 4.8.1.0 or the latest Beta version 4.9.0.0-beta as soon as possible. Regularly audit your admin dashboard for any unexpected devices that may have made it through their defenses! You've got this! Follow these steps to secure your media fortress today! 🛡️
| Product | Versions | Fixed in |
|---|---|---|
| emby/emby | < 4.8.1.0 | 4.8.1.0 |