CVE-2026-6646 is a stored cross-site scripting vulnerability in the The7 WordPress theme caused by insufficient sanitization and escaping of the 'title' parameter within the 'link' shortcode used by the 'dt_default_button' shortcode. Authenticated users with Contributor or higher privileges can inject arbitrary JavaScript that executes in the context of users viewing the compromised page. This vulnerability affects all versions up to 14.3.2 and has a CVSS 3.1 base score of 6.4, reflecting a medium severity level. No vendor advisory or patch is currently available, and the vulnerability is not related to a cloud service.

An attacker with Contributor-level or higher access can inject persistent malicious scripts into pages, which execute in the browsers of users who visit those pages. This can lead to theft of user credentials, session hijacking, or other malicious actions within the context of the affected website. The vulnerability does not affect availability and requires authenticated access, but it impacts confidentiality and integrity.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict Contributor-level access to trusted users only and consider disabling or limiting use of the vulnerable shortcode. Monitor for suspicious activity related to shortcode usage. Avoid granting unnecessary privileges to users to reduce risk.