CVE-2026-66598: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Kingtech LLC. B2BKing Premium

This vulnerability (CVE-2026-66598) affects B2BKing Premium versions up to 5.6.07 and is an unauthenticated Cross-Site Scripting (XSS) issue. It arises from improper neutralization of input during web page generation, allowing attackers to execute arbitrary scripts in the context of the affected application. The CVSS 3.1 base score is 7.1, indicating a high severity with network attack vector, low attack complexity, no privileges required, user interaction required, and impacts on confidentiality, integrity, and availability with scope changed.

Successful exploitation can lead to execution of arbitrary scripts in users' browsers, potentially resulting in data theft, session hijacking, or other malicious actions affecting confidentiality, integrity, and availability of the application and its users. The vulnerability is exploitable without authentication, increasing the risk exposure.

No official patch or remediation guidance is provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider applying input validation and output encoding controls as temporary mitigations to reduce XSS risks.