CVE-2025-64710 is a cross-site scripting (XSS) vulnerability classified under CWE-79, found in Bitfoundation's Bitplatform Boilerplate, a Visual Studio and .NET project template widely used for web application development. The vulnerability affects versions prior to 9.11.3, specifically within the WebInteropApp/WebAppInterop components responsible for web page generation. The root cause is improper neutralization of input, meaning that user-supplied data is not adequately sanitized or encoded before being embedded into web pages. This allows attackers to inject malicious JavaScript code that executes in the context of the victim's browser, potentially leading to session hijacking, defacement, or redirection to malicious sites. The CVSS 4.0 base score of 5.3 reflects a medium severity, with an attack vector of network (remote), low attack complexity, no privileges or authentication required, but requiring user interaction (e.g., victim clicking a crafted link). The vulnerability does not impact the confidentiality, integrity, or availability of the server directly but compromises client-side security and user trust. No known exploits have been reported in the wild as of the publication date (November 13, 2025). The issue is resolved in Bitplatform Boilerplate version 9.11.3, which includes proper input sanitization and encoding to prevent script injection. Applications built on affected versions of Bitplatform Boilerplate may inherit this vulnerability if they do not implement additional input validation or output encoding.

For European organizations, the primary impact of CVE-2025-64710 lies in the potential compromise of end-user security and trust. Exploitation can lead to theft of session cookies, unauthorized actions performed on behalf of users, phishing attacks, or distribution of malware through injected scripts. This is particularly critical for organizations providing web applications or digital services to customers, as successful attacks can damage reputation and lead to regulatory scrutiny under GDPR if personal data is compromised. The vulnerability affects applications built on Bitplatform Boilerplate, which is popular among .NET developers; thus, software vendors and enterprises using this framework are at risk. The attack requires user interaction but no authentication, increasing the attack surface. While the server infrastructure remains unaffected in terms of availability or integrity, the client-side impact can disrupt business operations and customer confidence. European sectors such as finance, healthcare, and e-commerce, which rely heavily on secure web applications, may face increased risks if vulnerable applications are deployed without patches.

European organizations should immediately upgrade all Bitplatform Boilerplate instances to version 9.11.3 or later to remediate the vulnerability. Developers should review their applications for any inherited XSS risks, especially in WebInteropApp/WebAppInterop components, and implement robust input validation and output encoding consistent with OWASP guidelines. Employ Content Security Policy (CSP) headers to restrict script execution and reduce the impact of potential XSS attacks. Conduct thorough security testing, including automated and manual penetration tests focusing on input handling and script injection vectors. Educate developers on secure coding practices to prevent similar vulnerabilities in custom code. Monitor web application logs for suspicious activities indicative of attempted XSS exploitation. For public-facing applications, consider deploying Web Application Firewalls (WAFs) with rules targeting XSS patterns as an additional protective layer. Finally, maintain an up-to-date inventory of applications using Bitplatform Boilerplate to ensure timely patch management.