CVE-2025-3191: react-draft-wysiwyg XSS Vulnerability

CVE-2025-3191 Overview

CVE-2025-3191 is a Cross-Site Scripting (XSS) vulnerability affecting all versions of the react-draft-wysiwyg package. The vulnerability exists in the Embedded button functionality, which allows attackers to inject malicious payloads that are subsequently saved within <iframe> tags. This stored XSS vulnerability can lead to unauthorized script execution in users' browsers when they view content created with the affected editor component.

Critical Impact

All versions of react-draft-wysiwyg are vulnerable to stored XSS attacks through the Embedded button feature, potentially compromising user sessions and sensitive data across applications using this popular React WYSIWYG editor component.

Affected Products

• react-draft-wysiwyg (all versions)

Discovery Timeline

• April 4, 2025 - CVE-2025-3191 published to NVD
• April 7, 2025 - Last updated in NVD database

Technical Details for CVE-2025-3191

Vulnerability Analysis

This Cross-Site Scripting vulnerability (CWE-79) allows attackers to inject malicious JavaScript code through the Embedded button feature in the react-draft-wysiwyg editor. The vulnerability occurs because user-supplied input is not properly sanitized before being inserted into <iframe> tags. When a victim views content containing the malicious payload, the injected script executes within the context of the victim's browser session.

The attack requires user interaction—specifically, a victim must view the page containing the malicious embedded content. Once executed, the attacker's script can access cookies, session tokens, and other sensitive information stored in the browser, or perform actions on behalf of the authenticated user.

Root Cause

The root cause of this vulnerability is insufficient input validation and sanitization in the Embedded button functionality. When users embed content through the editor, the package fails to properly escape or filter potentially malicious input before storing it in <iframe> elements. This allows attackers to craft payloads that bypass any existing security controls and execute arbitrary JavaScript when the content is rendered.

Attack Vector

The attack is network-based and requires an attacker to craft a malicious payload that exploits the Embedded button feature. The attacker would need to submit content through the react-draft-wysiwyg editor that includes a specially crafted embedded element. When this content is saved and subsequently viewed by other users, the malicious script executes in their browser context.

The vulnerability can be exploited in scenarios where:

• Content created with the editor is displayed to other users
• The application allows user-generated content with embedded elements
• Insufficient Content Security Policy (CSP) headers are in place

Technical details and proof-of-concept information are available in the GitHub Gist PoC Script and the Snyk Security Vulnerability Report.

Detection Methods for CVE-2025-3191

Indicators of Compromise

• Suspicious <iframe> elements containing JavaScript event handlers or javascript: protocol URLs in stored content
• Unexpected script execution or browser behavior when viewing user-generated content created with react-draft-wysiwyg
• User reports of session hijacking or unauthorized actions on accounts that recently viewed embedded content
• Anomalous network requests to external domains originating from pages with react-draft-wysiwyg content

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block XSS payloads in requests targeting content submission endpoints
• Deploy browser-based XSS detection tools and Content Security Policy violation reporting
• Review stored content databases for suspicious <iframe> tags containing malicious patterns
• Monitor application logs for unusual embedded content submissions or patterns indicative of XSS testing

Monitoring Recommendations

• Enable Content Security Policy (CSP) reporting to detect and alert on policy violations that may indicate XSS attempts
• Implement real-time monitoring of user-generated content for known XSS payload signatures
• Set up alerts for unusual patterns in embedded content creation or modification activities
• Monitor for reports from users experiencing unexpected behavior after viewing editor-generated content

How to Mitigate CVE-2025-3191

Immediate Actions Required

• Audit all existing content created with react-draft-wysiwyg for potentially malicious embedded payloads
• Implement server-side input validation and output encoding for all content processed through the editor
• Deploy strict Content Security Policy headers to restrict script execution sources
• Consider temporarily disabling the Embedded button feature until a patch is available

Patch Information

As of the last update, no official patch has been released for this vulnerability. All versions of the react-draft-wysiwyg package remain affected. Organizations should monitor the Snyk Security Vulnerability Report for updates on remediation options and potential patches.

Workarounds

• Implement server-side sanitization using libraries like DOMPurify to filter embedded content before storage
• Disable the Embedded button feature in the editor configuration if it is not essential to your application
• Deploy strict Content Security Policy headers with frame-src directives to limit iframe sources
• Implement output encoding when rendering editor content to prevent script execution

# Example: Implementing CSP headers in Express.js
# Add to server configuration to mitigate XSS impact
app.use((req, res, next) => {
  res.setHeader("Content-Security-Policy", 
    "default-src 'self'; script-src 'self'; frame-src 'self' https://trusted-domain.com");
  next();
});