CVE-2025-47977
📋 TL;DR
This cross-site scripting (XSS) vulnerability in Nuance Digital Engagement Platform allows attackers to inject malicious scripts into web pages viewed by other users. Attackers can spoof content and potentially steal session cookies or credentials. Organizations using vulnerable versions of the platform are affected.
💻 Affected Systems
- Nuance Digital Engagement Platform
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover, session hijacking, credential theft, and unauthorized access to sensitive customer data through malicious script execution in users' browsers.
Likely Case
Session hijacking, credential theft, content spoofing, and potential redirection to malicious sites affecting platform users.
If Mitigated
Limited impact with proper input validation, output encoding, and Content Security Policy (CSP) headers in place.
🎯 Exploit Status
XSS vulnerabilities typically have low exploitation complexity. Attack requires user interaction with malicious link or content.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Will be specified in Microsoft's monthly security update
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-47977
Restart Required: Yes
Instructions:
1. Monitor Microsoft's security advisory for patch release. 2. Apply security update through standard patch management process. 3. Restart affected services after patch installation. 4. Verify fix implementation.
🔧 Temporary Workarounds
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources
Add to web server configuration: Content-Security-Policy: default-src 'self'; script-src 'self'
Input Validation Filtering
allImplement server-side input validation to reject malicious scripts
Implement input sanitization in web application code
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) with XSS protection rules
- Disable vulnerable features or restrict access to affected components
🔍 How to Verify
Check if Vulnerable:
Test for XSS by attempting to inject script payloads into user input fields and observing if they executeCheck Version:
Check platform version through administrative interface or configuration filesVerify Fix Applied:
After patch, retest XSS payloads to confirm they are properly sanitized and do not execute📡 Detection & Monitoring
Log Indicators:
- Unusual script tags in HTTP requests
- Multiple failed XSS attempts
- Suspicious user agent strings
Network Indicators:
- Malformed HTTP requests with script payloads
- Requests to known XSS testing endpoints
SIEM Query:
source="web_server" AND (http_request CONTAINS "<script>" OR http_request CONTAINS "javascript:")