CVE-2025-10126 is a stored cross-site scripting vulnerability in the MyBrain Utilities WordPress plugin (versions up to 1.0.8). It occurs due to improper neutralization of input in the 'mbumap' shortcode, where user-supplied attributes are not adequately sanitized or escaped. Authenticated attackers with contributor or higher privileges can inject arbitrary JavaScript that executes in the context of users viewing the compromised page. This vulnerability has a CVSS 3.1 base score of 6.4 (medium severity), reflecting network attack vector, low attack complexity, required privileges at the contributor level, no user interaction, and impacts on confidentiality and integrity but not availability.

An attacker with contributor-level or higher access can inject persistent malicious scripts into pages via the vulnerable shortcode. These scripts execute in the browsers of users who visit the infected pages, potentially leading to theft of sensitive information or unauthorized actions performed in the context of the victim user. The vulnerability does not affect availability and requires authenticated access, limiting the attack surface to users with some level of trust on the site.

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 removing the MyBrain Utilities plugin if possible. Monitor for plugin updates from the vendor that address this vulnerability.