Nextendweb Nextend Facebook Connect versions up to 3.1.19 contain a stored cross-site scripting vulnerability due to improper input neutralization during web page generation. This flaw allows attackers with at least low privileges and requiring user interaction to inject malicious scripts that can lead to partial confidentiality, integrity, and availability impacts. The vulnerability has a CVSS 3.1 base score of 6.5, reflecting network attack vector, low attack complexity, required privileges, user interaction, and impacts on confidentiality, integrity, and availability.

Successful exploitation of this stored XSS vulnerability could allow an attacker to execute arbitrary scripts in the context of affected users, potentially leading to partial disclosure of sensitive information, modification of data, or disruption of service. The impact is limited to the scope defined by the CVSS vector, requiring user interaction and some privileges.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider limiting privileges of users who can input data and be cautious of user-generated content. Monitor vendor channels for updates and apply patches promptly once available.