The reported security threat concerns a Stored Cross Site Scripting (XSS) vulnerability in LiveHelperChat version 4.61, specifically exploitable via the chat transfer function. LiveHelperChat is an open-source web-based live support chat system commonly used by organizations to provide real-time customer support. Stored XSS vulnerabilities occur when malicious input is persistently stored on the target server and later rendered in users' browsers without proper sanitization or encoding, allowing attackers to execute arbitrary JavaScript code in the context of the victim's browser session. In this case, the vulnerability resides in the chat transfer functionality, which likely allows transferring an ongoing chat session to another operator or department. An attacker can inject malicious scripts into the chat transfer input fields, which are then stored and subsequently executed when viewed by operators or administrators. This can lead to session hijacking, credential theft, unauthorized actions on behalf of the user, or delivery of further malware payloads. The exploit code is available in text format, indicating that proof-of-concept scripts or payloads have been published, facilitating exploitation by attackers. Although no CVSS score is provided, the vulnerability is classified as medium severity, reflecting moderate impact and exploitation complexity. No patch links are currently available, and no known exploits in the wild have been reported, suggesting that the vulnerability is either newly disclosed or under limited active exploitation. The absence of affected versions details implies that version 4.61 is confirmed vulnerable, but it is unclear if earlier or later versions are affected. The vulnerability targets web applications, making it relevant for organizations deploying LiveHelperChat for customer interaction.

For European organizations using LiveHelperChat 4.61, this stored XSS vulnerability poses significant risks to confidentiality and integrity of customer communications and internal operations. Attackers exploiting this flaw can execute arbitrary scripts in the browsers of support agents or administrators, potentially stealing session cookies, credentials, or sensitive customer data. This can lead to unauthorized access to internal systems, data breaches, and reputational damage. Additionally, attackers may manipulate chat sessions, disrupt customer support workflows, or use the platform as a pivot point for further attacks within the corporate network. Given the role of LiveHelperChat in customer engagement, exploitation could undermine trust and compliance with data protection regulations such as GDPR. The medium severity rating reflects that exploitation requires targeting users with appropriate privileges (e.g., support staff) and some user interaction (viewing the malicious chat transfer), but the persistent nature of stored XSS increases the attack window and potential impact. Organizations with high customer interaction volumes or sensitive data handled via chat are particularly at risk.

To mitigate this vulnerability, European organizations should immediately assess their LiveHelperChat deployment and apply any available patches or updates from the vendor once released. In the absence of official patches, organizations should implement strict input validation and output encoding on all chat transfer inputs to neutralize malicious scripts. Employing a web application firewall (WAF) with rules targeting XSS payloads can provide temporary protection. Additionally, restricting chat transfer functionality to trusted users and monitoring logs for suspicious input patterns can reduce exploitation risk. Educating support staff about the risks of executing untrusted content and enforcing least privilege principles for chat system access are critical. Regular security assessments and penetration testing focusing on web application vulnerabilities should be conducted to detect similar issues proactively. Finally, organizations should prepare incident response plans to quickly contain and remediate any exploitation attempts.