🛡️ CVE-2025-64113 — emby

🔴 CVSS 9.8 — Critical ✅ No Known Exploit CWE-640 NVD
9.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Withdrawn Advisory: Emby Server API Vulnerability allowing to gain administrative access without precondition

Withdrawn Advisory

This advisory has been withdrawn because it incorrectly listed [MediaBrowser.Server.Core](https://www.nuget.org/packages/MediaBrowser.Server.Core) as vulnerable. CVE-2025-64113 affects Emby Server versions 4.9.1.80 and prior, and Emby Server Beta versions 4.9.2.6 and prior.

Original Description

Impact

This vulnerability affects all Emby Server versions - beta and stable up to the specified versions.

It allows an attacker to gain full administrative access to an Emby Server (for Emby Server administration, not at the OS level,).

Other than network access, no specific preconditions need to be fulfilled for a server to be vulnerable.

Patches

Quick Fix

A quick fix will be rolled out via an update to one of the default-included Emby Server plugins.

This way is chosen because many users are updating their servers manually while plugin updates are typically configured to be applied automatically. This allows to get a patch deployed to a large amount of servers within a single day.

Server Patches

Patched versions for both, Emby Server stable and Emby Server beta are available now.

All Emby Server owners are strongly encouraged to apply those updates as soon as possible.

Workarounds

> [!NOTE]

> These workarounds are OBSOLETE now. Please update Emby Server instead!

As and immediate remedy, it is possible to set restricted file system permissions on the passwordreset.txt file in the configuration folder of Emby Server. If it doesn't exist, users can create the file themselves or just call the ForgotPassword API once, which will create the file.

On Windows, users can set DENY permissions for "Authenticated users" and on Linux, permissions can be set via sudo chmod 444 passwordreset.txt.

This will make the API request fail, which completely eliminates the vulnerability.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2025-64113 is classified as CWE-640: Weak Password Recovery Mechanism. The account recovery flow is easier to defeat than the password it protects.

Affected software

CVE-2025-64113 is recorded against 2 packages.

  • emby
  • mediabrowser.server.core (fixed in 4.9.1.81)

Timeline and source

Published on 9 December 2025 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com

Details

Severity CRITICAL
CVSS Score 9.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-640
Public Exploit ✅ No
Source NVD
Published 2025-12-09
Updated 2026-08-12
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
emby — —
mediabrowser.server.core — 4.9.1.81

Similar Threats

Exploit Protection

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