CVE-2025-6262 is a Stored Cross-Site Scripting (XSS) vulnerability identified in the muse.ai video embedding plugin for WordPress, affecting all versions up to and including 0.4. This vulnerability arises from improper neutralization of input during web page generation (CWE-79). Specifically, the plugin's muse-ai shortcode fails to sufficiently sanitize and escape user-supplied attributes, allowing authenticated users with contributor-level access or higher to inject arbitrary JavaScript code into pages. When other users visit these compromised pages, the injected scripts execute in their browsers, potentially leading to session hijacking, privilege escalation, or unauthorized actions within the context of the affected WordPress site. The vulnerability has a CVSS 3.1 base score of 6.4, indicating a medium severity level. The attack vector is network-based with low attack complexity, requiring privileges equivalent to contributor access but no user interaction is needed for exploitation. The scope is changed, meaning the vulnerability can affect resources beyond the initially compromised component, such as other users' sessions or site content integrity. No known exploits are currently reported in the wild, and no official patches have been published yet. This vulnerability is particularly concerning for WordPress sites that utilize the muse.ai video embedding plugin, especially those that allow multiple contributors or editors to add content, as it enables malicious insiders or compromised contributor accounts to embed harmful scripts that affect all visitors to the site.

For European organizations, this vulnerability poses a significant risk to the confidentiality and integrity of their web platforms, especially those relying on WordPress with the muse.ai plugin for video content embedding. Exploitation could lead to unauthorized access to user sessions, theft of sensitive information such as authentication tokens or personal data, and manipulation of site content. This can damage organizational reputation, lead to regulatory non-compliance under GDPR due to data breaches, and disrupt business operations by undermining user trust. Since the vulnerability requires contributor-level access, insider threats or compromised contributor accounts are the primary vectors, making it critical for organizations with collaborative content management workflows to be vigilant. The absence of user interaction for exploitation means that any visitor to a compromised page is at risk, broadening the impact. Additionally, the scope change indicates potential cascading effects beyond the initial injection point, possibly affecting multiple users and site components. Given the widespread use of WordPress across European enterprises, media outlets, educational institutions, and government websites, the vulnerability could have broad implications if exploited.

Organizations should immediately audit their WordPress installations to identify the presence of the muse.ai video embedding plugin and verify the version in use. Until an official patch is released, it is advisable to disable or remove the plugin to eliminate the attack surface. Restrict contributor-level access strictly to trusted users and implement multi-factor authentication to reduce the risk of account compromise. Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious shortcode attribute patterns that may indicate XSS payloads. Conduct regular security training for content contributors to recognize and avoid unsafe practices. Monitor website logs for unusual activity or unexpected script injections. Additionally, implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts on web pages. Once a patch becomes available, prioritize prompt application and test thoroughly in staging environments before deployment. Consider deploying security plugins that perform input sanitization and output escaping as an additional safeguard. Finally, maintain regular backups of website content to enable rapid recovery in case of compromise.