Stored Cross-Site Scripting (XSS) Vulnerability in the Categorization Option of My Subscriptions Functionality in Silverpeas Core 6.3.1 <= 6.4.1 allows a remote attacker to execute arbitrary JavaScript code. This is achieved by injecting a malicious payload into the Name field of a subscription. The attack can lead to session hijacking, data theft, or unauthorized actions when an admin user views the affected subscription.