How the CVE Works:
The vulnerability in Trix Editor (versions < 2.1.15) stems from insufficient input sanitization during paste operations. When a user copies and pastes malicious HTML/JavaScript content, the editor fails to strip or escape dangerous elements, allowing script execution in the victim’s browser. Attackers craft payloads embedding ``.
- Trick users into pasting it into Trix Editor.
3. Payload executes in their session.
Detection:
// Check if Trix version is vulnerable: console.log(Trix.VERSION); // Outputs < 2.1.15
Mitigation:
1. Update: Upgrade to Trix 2.1.15+.
2. Sanitization: Use DOMPurify before rendering:
import DOMPurify from 'dompurify'; const clean = DOMPurify.sanitize(pastedContent);
3. CSP Header: Enforce:
Content-Security-Policy: default-src 'self'; script-src 'unsafe-inline'
Exploit PoC:
<!-- Malicious paste payload -->
<img src=x onerror=alert('XSS')>
Server-Side Fix (Ruby on Rails example):
In the controller, sanitize input: ActionController::Base.helpers.sanitize(params[:content])
Log Analysis:
grep -r "Trix.VERSION" /app/logs Find vulnerable instances
Patch Diff (Trix 2.1.15):
+ sanitizePastedHTML(html) {
+ return html.replace(/<script.?>.?<\/script>/gi, '');
+ }
References:
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
