CVE-2025-64113: Withdrawn Advisory Emby Server API Vulnerability Allowing Vulnerability

CRITICAL
Advisory Identifier: GHSA-95fv-5gfj-2r84
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CWE-640
Published
Advisory Summary

CVE-2025-64113 is a CRITICAL emby server api vulnerability allowing vulnerability (CWE-640: Weak Password Recovery Mechanism for Forgotten Password) affecting Withdrawn Advisory libraries in the NuGet ecosystem. The issue involves emby server api vulnerability allowing to gain administrative access without precondition. Remediation is available by upgrading affected packages to version 4.9.1.81.

CVE-2025-64113 at a Glance

CVE Identifier CVE-2025-64113
GHSA Identifier GHSA-95fv-5gfj-2r84
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-640: Weak Password Recovery Mechanism for Forgotten Password
Affected Product Withdrawn Advisory
Package Ecosystem NuGet
Published Date
Last Updated

How to Fix CVE-2025-64113

To remediate this vulnerability, upgrade all affected Withdrawn Advisory dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

MediaBrowser.Server.Core fixed: 4.9.1.81 
Upgrade MediaBrowser.Server.Core to 4.9.1.81
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for MediaBrowser.Server.Core

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-64113, inspect your project dependencies for Withdrawn Advisory:

inspect dependencies for MediaBrowser.Server.Core

Analyze the terminal output to locate any version of Withdrawn Advisory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.9.1.81), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-640: Weak Password Recovery Mechanism for Forgotten Password, where the product contains a mechanism for users to recover or change their passwords without knowing the original password, but the mechanism is weak. In Withdrawn Advisory, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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.

CVE-2025-64113 Affected Withdrawn Advisory Versions

1 component(s)
Fixed Versions:
4.9.1.81
Product / Package Ecosystem Affected Versions Fixed Version
MediaBrowser.Server.Core
nuget/MediaBrowser.Server.Core
NuGet
< 4.9.1.81
4.9.1.81

References

GitHub Advisory / Wiki ADVISORY
https://github.com/EmbySupport/Emby.Security/security/advisories/GHSA-95fv-5gfj-2r84
NVD — CVE-2025-64113 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-64113
Withdrawn Advisory Source Repository REPOSITORY
https://github.com/EmbySupport/Emby.Security

Frequently Asked Questions

What is CVE-2025-64113?
CVE-2025-64113 is a security vulnerability in Withdrawn Advisory involving Emby Server API Vulnerability allowing to gain administrative access without precondition under CWE-640: Weak Password Recovery Mechanism for Forgotten Password.
Which Withdrawn Advisory versions are affected?
Affected versions include releases prior to 4.9.1.81 across affected packages: MediaBrowser.Server.Core.
What version fixes CVE-2025-64113?
Upgrading to 4.9.1.81 (or the latest patched release for your respective branch) resolves the vulnerability.
Is MediaBrowser.Server.Core affected?
Yes, MediaBrowser.Server.Core is affected in releases prior to 4.9.1.81. Upgrade your dependency to 4.9.1.81 or later.
What CWE is associated with CVE-2025-64113?
CVE-2025-64113 is classified under CWE-640: Weak Password Recovery Mechanism for Forgotten Password (The product contains a mechanism for users to recover or change their passwords without knowing the original password, but the mechanism is weak.).
How can I check NuGet dependencies for CVE-2025-64113?
Run the dependency tree command: 'inspect dependencies for MediaBrowser.Server.Core'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-95fv-5gfj-2r84",
  "modified" : "2025-12-29T19:43:24Z",
  "published" : "2025-12-08T16:25:53Z",
  "withdrawn" : "2025-12-29T19:43:24Z",
  "aliases" : [ "CVE-2025-64113" ],
  "summary" : "Withdrawn Advisory: Emby Server API Vulnerability allowing to gain administrative access without precondition",
  "details" : "### Withdrawn Advisory\nThis 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.\n\n### Original Description\n### Impact\n\nThis vulnerability affects all Emby Server versions - beta and stable up to the specified versions.\nIt allows an attacker to gain full administrative access to an Emby Server (for Emby Server administration, **not at the OS level**,).\nOther than network access, no specific preconditions need to be fulfilled for a server to be vulnerable.\n\n### Patches\n\n#### Quick Fix\n\nA quick fix will be rolled out via an update to one of the default-included Emby Server plugins.\nThis 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.\n\n#### Server Patches\n\nPatched versions for both, Emby Server stable and Emby Server beta are available now.\n\n**All Emby Server owners are strongly encouraged to apply those updates as soon as possible.**\n\n\n### Workarounds\n\n> [!NOTE]\n> These workarounds are OBSOLETE now. Please update Emby Server instead!\n\nAs 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.\n\nOn Windows, users can set DENY permissions for \"Authenticated users\" and on Linux, permissions can be set via `sudo chmod 444 passwordreset.txt`.\nThis will make the API request fail, which completely eliminates the vulnerability.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "MediaBrowser.Server.Core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.9.1.81"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.9.1.80"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/EmbySupport/Emby.Security/security/advisories/GHSA-95fv-5gfj-2r84"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-64113"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/EmbySupport/Emby.Security"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-640" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-12-08T16:25:53Z",
    "nvd_published_at" : "2025-12-09T20:15:54Z"
  }
}