CVE-2025-64325: Emby Server is Vulnerable to Remote Code Execution Through XSS in Admin Dashboard

Severity: critical (CVSS 9.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-11-18 · updated 2026-10-18
Weakness: CWE-79

Description

Emby Server is a personal media server. Prior to version 4.8.1.0 and prior to Beta version 4.9.0.0-beta, a malicious user can send an authentication request with a manipulated X-Emby-Client value, which gets added to the devices section of the admin dashboard without sanitization. This issue has been patched in version 4.8.1.0 and Beta version 4.9.0.0-beta.

Affected products

EmbySupport Emby.Security: before 4.8.1.0 — fixed in 4.8.1.0

How to fix

Upgrade to a fixed version: EmbySupport Emby.Security 4.8.1.0. Check the vendor advisory for mitigations.

References

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