This vulnerability involves improper input sanitization in the mcjh button shortcode plugin (versions ≤ 1.6.4) by Marcus C. J. Hartmann, which allows an attacker to inject and store malicious scripts (stored XSS). When a user accesses a page containing the injected shortcode, the malicious script executes in their browser, potentially leading to information disclosure, session hijacking, or other impacts consistent with stored XSS. The CVSS 3.1 vector indicates network attack vector, low attack complexity, requiring privileges and user interaction, with partial impact on confidentiality, integrity, and availability.

Successful exploitation of this vulnerability can result in execution of arbitrary scripts in the context of affected users, potentially leading to information disclosure, session hijacking, or other user-targeted attacks. The impact is rated medium with partial confidentiality, integrity, and availability impacts. There are no reports of active exploitation in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider disabling or removing the mcjh button shortcode plugin if feasible. Monitor vendor channels for updates and apply patches promptly once released.