The reported security threat concerns a stored Cross Site Scripting (XSS) vulnerability in LiveHelperChat version 4.61, specifically via the Facebook Integration Page Name field. LiveHelperChat is an open-source live chat support system commonly used by organizations to provide real-time customer service on their websites. The vulnerability arises because the application does not properly sanitize or encode user-supplied input in the Facebook Integration Page Name field, allowing an attacker to inject malicious JavaScript code that is stored persistently on the server. When legitimate users or administrators access the affected page or interface, the malicious script executes in their browsers under the context of the vulnerable site. This can lead to session hijacking, credential theft, unauthorized actions performed on behalf of the user, or the delivery of further malware. Stored XSS is more severe than reflected XSS because the malicious payload is saved on the server and served to multiple users without requiring the attacker to trick each victim individually. The exploit code is available as plain text, indicating that proof-of-concept or exploit scripts have been published, which could facilitate exploitation by attackers. Although no CVSS score is provided, the vulnerability is classified as medium severity, reflecting the moderate impact and exploitation complexity. No patch links are currently available, and there are no known exploits in the wild at the time of reporting. The lack of affected version details suggests the vulnerability specifically targets version 4.61, but it is unclear if earlier or later versions are impacted.

For European organizations using LiveHelperChat 4.61, this stored XSS vulnerability poses a significant risk to the confidentiality and integrity of user sessions and data. Attackers exploiting this flaw could hijack chat sessions, impersonate users or administrators, steal sensitive customer information, or manipulate chat interactions to spread misinformation or malware. This could damage customer trust, violate data protection regulations such as GDPR, and lead to reputational harm and potential legal consequences. The persistent nature of stored XSS means multiple users could be affected once the malicious payload is injected. Since LiveHelperChat is often integrated into customer-facing portals, the attack surface includes both internal staff and external clients, increasing the scope of impact. Although no widespread exploitation is reported, the availability of exploit code raises the risk of opportunistic attacks. Organizations relying on LiveHelperChat for customer engagement should consider this vulnerability a moderate threat that requires timely remediation to prevent abuse.

To mitigate this vulnerability, European organizations should first verify if they are running LiveHelperChat version 4.61 and assess whether the Facebook Integration feature is enabled. Immediate steps include disabling or restricting access to the Facebook Integration Page Name input field until a patch is available. Input validation and output encoding should be implemented to sanitize user-supplied data, preventing malicious scripts from being stored or executed. Organizations should monitor their web application logs and user activity for unusual behavior indicative of XSS exploitation. Applying web application firewalls (WAFs) with rules targeting XSS payloads can provide temporary protection. It is also advisable to follow LiveHelperChat's official channels for security updates or patches addressing this issue. In the absence of an official patch, organizations can consider custom code fixes or third-party security modules that enforce strict input sanitization. Additionally, educating administrators and users about the risks of XSS and safe browsing practices can reduce the likelihood of successful exploitation.