What is CVE-2025-64325?

CVE-2025-64325 is a critical-severity vulnerability in Emby, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2025-11-18.

How severe is CVE-2025-64325?

Critical severity. CVSS v3 base score is 9.0 out of 10.

XSS in Emby

CVE-2025-64325

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.004 (34.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.

Affected products

Emby
Embysupport Emby.security — versions Emby Server (Web App) < 4.8.1.0, Emby Server Beta (Web App) < 4.9.0.0-beta

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2025-64325?: CVE-2025-64325 is a critical-severity vulnerability in Emby, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2025-11-18.
How severe is CVE-2025-64325?: Critical severity. CVSS v3 base score is 9.0 out of 10.