The security threat concerns a stored Cross Site Scripting (XSS) vulnerability in LiveHelperChat version 4.61. LiveHelperChat is an open-source live chat support system commonly used by organizations to provide real-time customer service on websites. The vulnerability arises specifically through the Telegram Bot Username field, which is not properly sanitized or validated before being stored and subsequently rendered in the web interface. An attacker can craft a malicious payload within the Telegram Bot Username input, which, when stored, will execute arbitrary JavaScript code in the context of the victim's browser when the affected page is viewed. This stored XSS can lead to session hijacking, credential theft, unauthorized actions on behalf of the user, or distribution of malware. The exploit code is available in textual format, indicating that proof-of-concept payloads or injection vectors have been published, facilitating exploitation by attackers. Although no CVSS score is assigned, the vulnerability is classified as medium severity by the source. The lack of patch links suggests that an official fix may not yet be available, increasing the risk for organizations using this version. The vulnerability affects web-based components, making it exploitable remotely via user interaction with the chat interface or administrative panels where the Telegram Bot Username is displayed.

For European organizations deploying LiveHelperChat 4.61, this vulnerability poses a significant risk to the confidentiality and integrity of user sessions and data. Attackers exploiting the stored XSS can hijack user sessions, potentially gaining unauthorized access to sensitive customer information or internal support communications. This can lead to data breaches, reputational damage, and regulatory non-compliance under GDPR. The availability impact is limited but could be leveraged in combination with other attacks to disrupt services. Since LiveHelperChat is often integrated into customer-facing websites, the attack surface includes both end-users and support staff, broadening the scope of potential victims. The presence of exploit code increases the likelihood of exploitation attempts, especially in environments where patching is delayed. European organizations with high customer interaction volumes or handling sensitive data are at elevated risk.

Organizations should immediately audit their LiveHelperChat installations to determine if version 4.61 is in use. If so, they should consider upgrading to a later version where this vulnerability is patched once available. In the interim, input validation and output encoding should be enforced on the Telegram Bot Username field to neutralize malicious scripts. Web application firewalls (WAFs) can be configured to detect and block typical XSS payloads targeting this vector. Additionally, restricting the ability to set or modify the Telegram Bot Username to trusted administrators reduces the risk of injection. Monitoring logs for suspicious input patterns and unusual user behavior can help detect exploitation attempts early. Educating support staff about the risks and signs of XSS attacks can also improve incident response. Finally, organizations should implement Content Security Policy (CSP) headers to limit the impact of any injected scripts.