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Filemaker ServerApplication · Claris

CVE-2025-46294

MEDIUM · 5.3 CVSS v3.1 Published 2025-12-16
Fix available
A fix is available. Upgrade to 22.0.4 or later.
See remediation →
62/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
To enhance security, the FileMaker Server 22.0.4 installer now includes an option to disable IIS short filename enumeration by setting NtfsDisable8dot3NameCreation in the Windows registry. This prevents attackers from using the tilde character to discover hidden files and directories. This vulnerability has been fully addressed in FileMaker Server 22.0.4. The IIS Shortname Vulnerability exploits how Microsoft IIS handles legacy 8.3 short filenames, allowing attackers to infer the existence of files or directories by crafting requests with the tilde (~) character.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

This is an information disclosure vulnerability in FileMaker Server on Windows where IIS short filename enumeration allows attackers to discover hidden files and directories by using the tilde (~) character in HTTP requests. The 8.3 naming convention legacy feature in Windows creates shortened versions of filenames that can be enumerated.

MitigationUpgrade to FileMaker Server 22.0.4 or later, which includes an option to disable IIS short filename enumeration by setting NtfsDisable8dot3NameCreation in the Windows registry.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Filemaker ServerApplication
Affected:< 22.0.4

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm FileMaker Server is installed
    Check for FileMaker Server installation directory, typically at C:\Program Files\FileMaker\ or look for FileMaker Server services in Windows Services (fmserver, fmsadmin).
    Affected if FileMaker Server is installed on this Windows host.
  2. Identify installed FileMaker Server version
    Check the FileMaker Server version: Open FileMaker Server Admin Console or check the version in the installation directory, or run 'fmsadmin -v' from the command line if available.
    Affected if Version is lower than 22.0.4.
  3. Verify IIS short filename enumeration is possible
    Attempt to access a known file on the FileMaker Server web root using IIS short filename format (e.g., request a URL with ~1 or ~2 suffix). Alternatively, check if the NtfsDisable8dot3NameCreation registry key exists under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem and note its value (1 means disabled, 0 or missing means enabled).
    Affected if NtfsDisable8dot3NameCreation is set to 0 or the registry key is missing, allowing 8.3 short filename creation.
  4. Confirm IIS is serving FileMaker Web Direct or Web Publishing
    Verify that IIS is configured with FileMaker Web Publishing or Web Direct modules enabled, as this exposes the web server interface where short filename enumeration can be performed.
    Affected if IIS is running with FileMaker web publishing components enabled.

The environment is affected if FileMaker Server version is below 22.0.4 AND NtfsDisable8dot3NameCreation is not set to 1 (disabled), allowing IIS short filename enumeration to discover hidden files.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 22.0.4 or later
Fixed in 22.0.4
Interim mitigation

Upgrade to FileMaker Server 22.0.4 or later, which includes an option to disable IIS short filename enumeration by setting NtfsDisable8dot3NameCreation in the Windows registry.

Recommended fix High confidence

FileMaker Server 22.0.4

  1. Download FileMaker Server 22.0.4 from the official Claris/Filemaker support site (support.claris.com)
  2. Run the FileMaker Server 22.0.4 installer on the Windows server
  3. During the installation process, select the option to disable IIS short filename enumeration (NtfsDisable8dot3NameCreation)
  4. Complete the installation following the on-screen prompts
  5. Verify the NtfsDisable8dot3NameCreation registry setting is configured to disable 8.3 name creation
Caveat Review FileMaker Server 22.0.4 release notes for any compatibility changes or deprecated features before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Filemaker Server Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing3.0 h
  • Review / QA2.0 h
9.0 hours of engineering $1,570
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-46294 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data