CVE-2025-6262 identifies a stored cross-site scripting (XSS) vulnerability in the muse.ai video embedding plugin for WordPress, present in all versions up to and including 0.4. The vulnerability arises from insufficient sanitization and escaping of user-supplied attributes within the plugin's muse-ai shortcode. Specifically, authenticated users with contributor-level permissions or higher can embed arbitrary JavaScript code into pages or posts via the shortcode parameters. When other users access these pages, the injected scripts execute in their browsers, potentially compromising session tokens, redirecting users, or performing unauthorized actions on behalf of the victim. The vulnerability does not require user interaction beyond visiting the affected page and has a CVSS 3.1 base score of 6.4, reflecting medium severity. The attack vector is network-based, with low attack complexity, requiring privileges equivalent to contributor role, and no user interaction. The scope is changed as the vulnerability affects other users viewing the injected content. No official patches or updates have been released at the time of this report, and no known exploits have been observed in the wild. The vulnerability is classified under CWE-79, which covers improper neutralization of input during web page generation leading to XSS. This issue highlights the importance of rigorous input validation and output encoding in WordPress plugins that process user-generated content or shortcode attributes.

The primary impact of this vulnerability is the compromise of confidentiality and integrity for users visiting affected pages. Attackers can steal session cookies, enabling account takeover or privilege escalation, deface website content, or perform actions on behalf of users with elevated privileges. Since the vulnerability requires contributor-level access, attackers must first gain authenticated access, which limits exposure but still poses a significant risk in environments with multiple content contributors or compromised accounts. The availability impact is minimal as the vulnerability does not directly cause denial of service. However, successful exploitation can damage organizational reputation, lead to data breaches, and facilitate further attacks such as phishing or malware distribution. Organizations relying on muse.ai video embedding in WordPress sites face risks of persistent malicious code injection, affecting site visitors and administrators alike. The scope of impact extends to all users accessing compromised pages, potentially including customers, partners, and internal staff. Without timely remediation, attackers could leverage this vulnerability to establish persistent footholds or pivot to other systems within the organization.

To mitigate CVE-2025-6262, organizations should immediately restrict contributor-level access to trusted users only, minimizing the risk of malicious shortcode injection. Administrators should audit existing content for suspicious or unauthorized muse-ai shortcode usage and sanitize or remove any untrusted inputs. Until an official patch is released, consider disabling or removing the muse.ai video embedding plugin to eliminate the attack surface. Employ web application firewalls (WAFs) with custom rules to detect and block malicious script patterns in shortcode parameters. Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. Regularly monitor logs and user activity for signs of exploitation attempts or unusual behavior. Educate content contributors about safe content practices and the risks of embedding untrusted code. Once a patched version is available, promptly update the plugin and verify that input sanitization and output escaping are correctly implemented. Additionally, enforce the principle of least privilege for WordPress roles and consider multi-factor authentication to reduce the risk of account compromise.