CVE-2025-15056
📋 TL;DR
A cross-site scripting (XSS) vulnerability exists in Quill's HTML export feature due to insufficient input validation. This allows attackers to inject malicious scripts that execute when users view exported HTML content. Organizations using Quill 2.0.3 for content editing or export functionality are affected.
💻 Affected Systems
- Quill
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal user session cookies, credentials, or sensitive data, perform actions on behalf of users, deface websites, or redirect users to malicious sites.
Likely Case
Attackers inject malicious scripts that execute in victims' browsers when viewing exported HTML content, potentially stealing session data or performing unauthorized actions.
If Mitigated
With proper input validation and output encoding, the risk is limited to potential data exposure if other vulnerabilities exist.
🎯 Exploit Status
Exploitation requires user interaction with exported HTML content. The advisory includes technical details but not full exploit code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check GitHub repository for latest version
Vendor Advisory: https://github.com/slab/quill
Restart Required: No
Instructions:
1. Check current Quill version
2. Update to latest version from GitHub repository
3. Test HTML export functionality
🔧 Temporary Workarounds
Disable HTML Export
allTemporarily disable or restrict access to the HTML export feature
Implement Input Validation
allAdd server-side validation and output encoding for HTML export content
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers
- Use web application firewall (WAF) rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check if using Quill 2.0.3 and HTML export feature is enabledCheck Version:
Check package.json or application configuration for Quill versionVerify Fix Applied:
Test HTML export with XSS payloads to ensure proper sanitization📡 Detection & Monitoring
Log Indicators:
- Unusual HTML export requests
- Requests containing script tags or JavaScript in export parameters
Network Indicators:
- HTTP requests to export endpoints with suspicious payloads
SIEM Query:
Search for POST/GET requests to export endpoints containing <script> or javascript: patterns