This vulnerability involves a cross-site scripting (CWE-79) flaw in the PdfViewer component of Agenzia Impresa Eccobook 2.81.1. An attacker can inject malicious scripts or HTML via the Temp parameter, which is not properly sanitized. The CVSS 3.1 base score is 8.8, indicating high severity with network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, and high impact on confidentiality, integrity, and availability.

Successful exploitation allows remote attackers to execute arbitrary scripts in the context of the affected application, potentially leading to theft of sensitive information, session hijacking, or other malicious actions impacting confidentiality, integrity, and availability.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, avoid using the vulnerable version or restrict access to the affected component to trusted users only. Monitor vendor communications for updates.