CVE-2025-63693
📋 TL;DR
This is a cross-site scripting (XSS) vulnerability in DzzOffice 2.3.x that allows low-privilege attackers to inject malicious JavaScript into comment editing templates. When victims open the editing pop-up, the attacker's code executes in their browser context. All DzzOffice 2.3.x installations with comment functionality enabled are affected.
💻 Affected Systems
- DzzOffice
📦 What is this software?
Dzzoffice by Dzzoffice
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform actions as authenticated users, redirect to malicious sites, or install malware through drive-by downloads.
Likely Case
Session hijacking, credential theft, defacement of comments, or limited account compromise through social engineering.
If Mitigated
With proper Content Security Policy (CSP) and input validation, impact reduces to minor UI manipulation or limited data exposure.
🎯 Exploit Status
Exploitation requires low-privilege authenticated access. Public GitHub repositories demonstrate proof-of-concept.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Monitor official DzzOffice repositories for security updates. 2. Apply proper output escaping in dzz/comment/template/edit_form.htm. 3. Sanitize user inputs before rendering in HTML/JavaScript contexts.
🔧 Temporary Workarounds
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources and prevent inline JavaScript execution.
Add to web server config: Content-Security-Policy: script-src 'self'
Disable Comment Editing
allTemporarily disable comment editing functionality until patch is available.
Modify DzzOffice configuration to remove comment editing permissions
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads in comment parameters
- Restrict user permissions to minimize who can create/edit comments
🔍 How to Verify
Check if Vulnerable:
Test by creating a comment with JavaScript payload like <script>alert('XSS')</script> and checking if it executes when editing.Check Version:
Check DzzOffice version in admin panel or configuration filesVerify Fix Applied:
Verify that user inputs are properly escaped in edit_form.htm template and JavaScript payloads no longer execute.📡 Detection & Monitoring
Log Indicators:
- Unusual comment creation/editing patterns
- JavaScript or HTML tags in comment content logs
Network Indicators:
- POST requests to comment endpoints with script tags or JavaScript code
SIEM Query:
source="web_logs" AND (uri="/dzz/comment" OR uri="/edit_form") AND (content="<script>" OR content="javascript:")