Silverpeas Core Stored Cross-Site Scripting Vulnerability in My Subscriptions Functionality

A stored cross-site scripting vulnerability has been identified in Silverpeas Core versions 6.3.1 through 6.4.1. This vulnerability allows remote attackers to execute arbitrary JavaScript by injecting malicious payloads into the Name field of subscriptions. The issue arises in the My Subscriptions feature, specifically within the Categorization option. When an admin user views the affected subscription, the injected script can execute, potentially leading to session hijacking, data theft, or unauthorized actions.

Impact

Exploitation of this vulnerability allows for stored cross-site scripting, where injected scripts are executed in the context of the user viewing the subscription, particularly affecting admin users.

Reproduction

To reproduce this vulnerability, log into the Silverpeas Core application and navigate to the My Subscriptions feature. Once there, create a new subscription and inject a JavaScript payload, such as an image tag with an onerror event, into the Name field. After saving the subscription, the injected script will execute, demonstrating the cross-site scripting vulnerability.

Remediation

Users can upgrade to Silverpeas Core version 6.4.2 to address this vulnerability.