The vulnerability CVE-2026-90563 affects maliangnansheng bbs-springboot version 3.0.0. It is a cross-site scripting issue caused by improper handling in the utils.toToc function of ArticleController.java. An attacker can exploit this remotely to execute scripts in the context of the affected application. The CVSS 4.0 vector indicates network attack vector, low attack complexity, low privileges required, and partial impact on integrity and availability.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the victim's browser, potentially leading to session hijacking, defacement, or other malicious actions within the context of the vulnerable application. The impact is rated medium based on the CVSS score of 5.1.

No patch or official fix information 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 or output encoding on the affected function to mitigate XSS risks.