The Betheme WordPress theme contains a stored XSS vulnerability due to improper neutralization of input during web page generation. Specifically, several shortcodes do not adequately sanitize or escape user-supplied attributes, enabling authenticated attackers with contributor or higher privileges to inject arbitrary JavaScript payloads. This vulnerability affects all versions up to 27.5.6. The CVSS 3.1 base score is 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N), reflecting network attack vector, low attack complexity, and partial confidentiality and integrity impact with no availability impact. No patch or remediation details are currently available from the vendor or public advisories.

An attacker with contributor-level or higher access can inject persistent malicious scripts into pages via vulnerable shortcodes. These scripts execute in the context of any user viewing the affected page, potentially leading to session hijacking, privilege escalation, or other client-side attacks. The vulnerability compromises confidentiality and integrity but does not affect availability. There are no known exploits in the wild at this time.

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 the use of Betheme shortcodes that accept user input. Monitor official MuffinGroup communications for updates regarding patches or mitigations.