CVE-2025-47977 is a high-severity cross-site scripting (XSS) vulnerability identified in the Microsoft Nuance Digital Engagement Platform version 1.0.0. The vulnerability stems from improper neutralization of input during web page generation, classified under CWE-79. This flaw allows an unauthorized attacker to inject malicious scripts into web pages viewed by other users. Exploiting this vulnerability requires no privileges and no prior authentication, but does require user interaction, such as clicking a crafted link or visiting a malicious page. The CVSS 3.1 base score of 8.2 reflects the network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), and a scope change (S:C) indicating that the vulnerability affects resources beyond the initially vulnerable component. The impact on confidentiality is high, as attackers can steal sensitive information such as session tokens or credentials. Integrity impact is low, as the attacker can inject scripts but cannot directly modify backend data. Availability is not affected. The vulnerability enables spoofing attacks, potentially allowing attackers to impersonate legitimate users or services within the platform. Although no known exploits are currently in the wild, the public disclosure and high severity score suggest that exploitation attempts may emerge. The Nuance Digital Engagement Platform is used for customer interaction management, including chatbots and digital engagement tools, making it a critical component in customer service workflows. Attackers leveraging this XSS vulnerability could compromise user sessions, redirect users to malicious sites, or perform actions on behalf of users, leading to reputational damage and data breaches.

For European organizations, the impact of CVE-2025-47977 is significant, especially for those relying on the Nuance Digital Engagement Platform to manage customer interactions and digital services. Successful exploitation could lead to unauthorized access to sensitive customer data, including personal identifiable information (PII), which is subject to strict regulations under GDPR. The confidentiality breach could result in regulatory fines and loss of customer trust. Furthermore, attackers could use the XSS vulnerability to conduct phishing or social engineering campaigns targeting European users, amplifying the risk of credential theft and fraud. The integrity impact, while lower, still poses risks of session hijacking and unauthorized actions within the platform. The lack of availability impact means service disruption is unlikely, but the reputational damage from data compromise could be severe. Organizations in sectors such as finance, healthcare, telecommunications, and public services, which often utilize digital engagement platforms, may face heightened risks due to the sensitivity of their data and regulatory scrutiny. Additionally, the cross-site scripting vulnerability could be leveraged as a foothold for more advanced attacks within enterprise networks.

To mitigate CVE-2025-47977, European organizations should prioritize the following actions: 1) Apply patches or updates from Microsoft as soon as they become available, as no patch links are currently provided, monitoring official Microsoft and Nuance advisories is critical. 2) Implement strict input validation and output encoding on all user-supplied data within the Nuance Digital Engagement Platform to prevent script injection. 3) Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. 4) Conduct thorough security testing, including automated and manual penetration testing focused on XSS vectors within the platform. 5) Educate users and administrators about the risks of clicking on suspicious links or interacting with untrusted content, as user interaction is required for exploitation. 6) Monitor web application logs and network traffic for unusual activities indicative of attempted XSS exploitation. 7) Consider deploying Web Application Firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting the Nuance platform. 8) Review and harden session management mechanisms to prevent session hijacking in case of successful script injection. These measures, combined with timely patching, will significantly reduce the risk posed by this vulnerability.