Security

What is Storage of File with Sensitive Data (CWE-219)?

Storage of File with Sensitive Data Under Web Root (CWE-219) occurs when sensitive data is stored under the web document root with insufficient access...

Shreya Pillai July 28, 2026 5 min read Security

AI-friendly summary

What it is: Storage of File with Sensitive Data Under Web Root (CWE-219) is a type of vulnerability that occurs when sensitive data is stored under the web document root with insufficient access control, making it accessible to untrusted parties.

Why it matters: This vulnerability can lead to confidentiality breaches and read application data. It's essential to prevent Storage of File with Sensitive Data Under Web Root by ensuring proper access control permissions and secure coding practices.

How to fix it: To fix this issue, avoid storing sensitive data under the web document root and ensure proper access control permissions.

TL;DR: Storage of File with Sensitive Data Under Web Root (CWE-219) occurs when sensitive data is stored under the web document root with insufficient access control, making it accessible to untrusted parties.

At-a-Glance

Field	Value
CWE ID	CWE-219
OWASP Category	A01:2025 - Broken Access Control
CAPEC	None
Typical Severity	Medium
Affected Technologies	Web applications, web servers, file systems
Detection Difficulty	Moderate
Last Updated	2026-07-28

What is Storage of File with Sensitive Data Under Web Root?

Storage of File with Sensitive Data Under Web Root (CWE-219) is a type of vulnerability that occurs when sensitive data is stored under the web document root with insufficient access control, making it accessible to untrusted parties. As defined by the MITRE Corporation under CWE-219, and classified by the OWASP Foundation under A01:2025 - Broken Access Control, this vulnerability can lead to confidentiality breaches and read application data.

Quick Summary

Storage of File with Sensitive Data Under Web Root (CWE-219) is a critical security issue that occurs when sensitive data is stored under the web document root with insufficient access control. This vulnerability can lead to confidentiality breaches and read application data, making it essential to prevent Storage of File with Sensitive Data Under Web Root by ensuring proper access control permissions and secure coding practices.

Storage of File with Sensitive Data Under Web Root Overview

What

Why it matters

This vulnerability can lead to confidentiality breaches and read application data. It’s essential to prevent Storage of File with Sensitive Data Under Web Root by ensuring proper access control permissions and secure coding practices.

Where it occurs

Storage of File with Sensitive Data Under Web Root (CWE-219) typically occurs in web applications, web servers, and file systems where sensitive data is stored under the web document root.

Who is affected

Any organization that stores sensitive data under the web document root without proper access control permissions can be affected by this vulnerability.

Who is NOT affected

Applications that never construct paths/queries/commands from external input are not affected by Storage of File with Sensitive Data Under Web Root (CWE-219).

How Storage of File with Sensitive Data Under Web Root Works

Root Cause

The root cause of Storage of File with Sensitive Data Under Web Root (CWE-219) is the storage of sensitive data under the web document root without proper access control permissions.

Attack Flow

An attacker gains access to the web application or server.
The attacker searches for sensitive data stored under the web document root.
The attacker accesses the sensitive data, leading to confidentiality breaches and read application data.

Prerequisites to Exploit

To exploit this vulnerability, an attacker must have access to the web application or server and be able to search for and access sensitive data stored under the web document root.

Vulnerable Code

import os

# Store sensitive data in a file under the web document root
with open('/var/www/html/sensitive_data.txt', 'w') as f:
    f.write('Sensitive Data')

This code stores sensitive data in a file under the web document root without proper access control permissions.

Secure Code

import os

# Store sensitive data in a secure location outside the web document root
with open('/var/sensitive_data.txt', 'w') as f:
    f.write('Sensitive Data')

This code stores sensitive data in a secure location outside the web document root with proper access control permissions.

Business Impact of Storage of File with Sensitive Data Under Web Root

Confidentiality

Storage of File with Sensitive Data Under Web Root (CWE-219) can lead to confidentiality breaches, exposing sensitive data to untrusted parties.

Integrity

This vulnerability can also lead to integrity breaches, allowing attackers to modify or delete sensitive data.

Availability

In some cases, Storage of File with Sensitive Data Under Web Root (CWE-219) can lead to availability breaches, making it difficult for legitimate users to access the system.

Storage of File with Sensitive Data Under Web Root Attack Scenario

An attacker gains access to the web application or server.
The attacker searches for sensitive data stored under the web document root.
The attacker accesses the sensitive data, leading to confidentiality breaches and read application data.

How to Detect Storage of File with Sensitive Data Under Web Root

Manual Testing

To detect this vulnerability manually, follow these steps:

Review the web application’s file system for sensitive data stored under the web document root.
Check access control permissions for files and directories containing sensitive data.
Use tools like find or grep to search for sensitive data in the file system.

Automated Scanners (SAST/DAST)

Automated scanners can also detect this vulnerability by analyzing code and identifying potential security issues. However, they may not catch all instances of Storage of File with Sensitive Data Under Web Root (CWE-219).

PenScan Detection

PenScan’s automated scanning engines actively test for this issue.

False Positive Guidance

To avoid false positives when detecting Storage of File with Sensitive Data Under Web Root (CWE-219), ensure that the scanner is configured to ignore files and directories containing sensitive data, and that access control permissions are properly set.

How to Fix Storage of File with Sensitive Data Under Web Root

Avoid storing sensitive data under the web document root

Store sensitive data in a secure location outside the web document root.

Ensure proper access control permissions

Set access control permissions for files and directories containing sensitive data to prevent unauthorized access.

Use secure coding practices

Use secure coding practices when developing web applications, such as validating user input and sanitizing output.

Framework-Specific Fixes for Storage of File with Sensitive Data Under Web Root

For Java:

import java.io.File;
import java.io.FileWriter;

// Store sensitive data in a secure location outside the web document root
File file = new File("/var/sensitive_data.txt");
FileWriter writer = new FileWriter(file);
writer.write("Sensitive Data");

For Node.js:

const fs = require('fs');

// Store sensitive data in a secure location outside the web document root
fs.writeFileSync('/var/sensitive_data.txt', 'Sensitive Data');

How to Ask AI to Check Your Code for Storage of File with Sensitive Data Under Web Root

You can use a copy-paste prompt in an AI coding assistant to review your code and identify potential vulnerabilities.

Copy-paste prompt

Review the following [language] code block for potential CWE-219 Storage of File with Sensitive Data Under Web Root vulnerabilities and rewrite it using proper access control permissions: [paste code here]

Storage of File with Sensitive Data Under Web Root Best Practices Checklist

✅ Avoid storing sensitive data under the web document root. ✅ Ensure proper access control permissions for files and directories containing sensitive data. ✅ Use secure coding practices when developing web applications.

Storage of File with Sensitive Data Under Web Root FAQ

How does Storage of File with Sensitive Data Under Web Root occur?

Storage of File with Sensitive Data Under Web Root occurs when sensitive data is stored under the web document root with insufficient access control, making it accessible to untrusted parties.

What are the common consequences of Storage of File with Sensitive Data Under Web Root?

The common consequences of Storage of File with Sensitive Data Under Web Root include read application data and confidentiality breaches.

How can I detect Storage of File with Sensitive Data Under Web Root in my code?

You can use manual testing, automated scanners (SAST/DAST), or PenScan’s detection capabilities to identify potential vulnerabilities.

What are the best practices for preventing Storage of File with Sensitive Data Under Web Root?

To prevent Storage of File with Sensitive Data Under Web Root, avoid storing sensitive data under the web document root and ensure proper access control permissions.

How can I fix Storage of File with Sensitive Data Under Web Root in my code?

You can use techniques such as avoiding storage of sensitive data under the web document root, ensuring proper access control permissions, and using secure coding practices.

Some common related vulnerabilities include CWE-552 (Files or Directories Accessible to External Parties).

How can I use AI to check my code for Storage of File with Sensitive Data Under Web Root?