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Unrestricted File UploadWeakness · CWE-434

CVE-2023-53950

CRITICAL · 9.8 CVSS v3.1 Published 2025-12-19
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Public exploit 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
InnovaStudio WYSIWYG Editor 5.4 contains an unrestricted file upload vulnerability that allows attackers to bypass file extension restrictions through filename manipulation. Attackers can upload malicious ASP shells by using null byte techniques and alternate file extensions to circumvent upload controls in the asset manager.

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

InnovaStudio WYSIWYG Editor 5.4 contains an unrestricted file upload vulnerability in its asset manager component. Attackers bypass file extension restrictions by using null byte injection (%00) and alternate file extensions to upload malicious ASP web shells, achieving remote code execution on the server.

MitigationDisable or remove the affected WYSIWYG editor component until a vendor patch is available. Implement strict server-side file validation with allowlist-based extension checking after null byte stripping, store uploads outside webroot, and execute uploaded files with least privilege.

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

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
High
Integrity
High
Availability
High

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

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. Identify InnovaStudio WYSIWYG Editor installation
    Search the webroot for files containing 'InnovaStudio' or 'innovaeditor' in filenames or directories. Check for version information in JS files (often in path like /innovaeditor/ or within editor JS files). Review application source code for references to 'InnovaStudio' or 'asset manager' component.
    Affected if InnovaStudio WYSIWYG Editor version 5.4 is found installed in the web application.
  2. Locate the asset manager component
    Check for the presence of an 'assetmanager' or 'assets' directory within the editor path. Look for files named 'assetmanager.asp', 'assetmanager.aspx', or similar server-side scripts in the editor installation directory.
    Affected if The asset manager component (assetmanager.asp/aspx) is present and accessible on the server.
  3. Verify file upload functionality exists
    Examine the asset manager script source code for file upload handling logic. Look for form submissions accepting file input, particularly examining how the 'FileName' or 'file' parameters are processed.
    Affected if The asset manager contains file upload handling code that accepts user-supplied filenames.
  4. Check for null byte sanitization in upload code
    Review the server-side upload validation code for proper input sanitization. Look specifically for code that strips or handles null byte (%00) sequences before processing uploaded filenames.
    Affected if The upload validation code does not strip or neutralize null byte (%00) characters from the filename parameter before using it in file operations.
  5. Identify allowed file extension configuration
    Locate the configuration or code defining permitted file extensions for uploads. Check for an allowlist of safe extensions and verify whether dangerous extensions like .asp, .aspx, or .cer are blocked.
    Affected if The configuration permits .asp, .aspx, or other executable extensions, or lacks proper extension allowlisting.

The environment is affected if InnovaStudio WYSIWYG Editor 5.4 is installed with its asset manager component accessible and the upload function lacks null byte sanitization and proper extension allowlisting.

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.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Disable or remove the affected WYSIWYG editor component until a vendor patch is available. Implement strict server-side file validation with allowlist-based extension checking after null byte stripping, store uploads outside webroot, and execute uploaded files with least privilege.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
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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-2023-53950 in production — separate from our analysis above.

No notes yet

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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
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  • Version or environment caveats, and links to real fixes
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