The vulnerability CVE-2026-39604 in zookatron MyBookTable Bookstore is a stored cross-site scripting (XSS) issue caused by improper input neutralization during web page generation. This allows attackers with high privileges to inject malicious scripts that are stored and later executed in the context of other users who view the affected pages. The issue affects all versions up to 3.6.0. The CVSS 3.1 vector indicates network attack vector, low attack complexity, high privileges required, user interaction required, and a scope change with limited impact on confidentiality, integrity, and availability. No patch or official remediation guidance has been provided by the vendor or authoritative sources yet.

Successful exploitation could allow an attacker with high privileges to inject and store malicious scripts that execute in other users' browsers, potentially leading to limited confidentiality, integrity, and availability impacts. The attack requires user interaction and high privileges, reducing the likelihood of widespread exploitation. No known exploits in the wild have been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, limit high-privilege user access and apply strict input validation and output encoding as a temporary mitigation to reduce the risk of stored XSS. Monitor vendor channels for updates regarding patches or official mitigations.