CVE-2025-11769 identifies a stored Cross-Site Scripting (XSS) vulnerability in the WordPress Content Flipper plugin developed by aumsrini. The flaw exists in all versions up to and including 0.1, specifically in the handling of the 'bgcolor' attribute within the 'flipper_front' shortcode. The root cause is insufficient sanitization and escaping of user-supplied input before rendering it on web pages. This allows authenticated users with contributor-level permissions or higher to inject arbitrary JavaScript code that is stored persistently in the WordPress database. When other users visit pages containing the injected shortcode, the malicious scripts execute in their browsers, potentially compromising session tokens, cookies, or enabling further attacks such as phishing or defacement. The vulnerability has a CVSS 3.1 base score of 6.4, reflecting medium severity with network attack vector, low attack complexity, and no user interaction required. The scope is changed because the vulnerability affects resources beyond the attacker’s privileges, impacting other users. Although no known exploits are currently reported in the wild, the vulnerability poses a significant risk due to the common use of WordPress and the plugin’s functionality in content presentation. The vulnerability was reserved on 2025-10-14 and published on 2025-11-13, with no official patches released yet. The CWE classification is CWE-79, indicating improper neutralization of input during web page generation.

For European organizations, this vulnerability could lead to unauthorized script execution in the browsers of site visitors or internal users, resulting in session hijacking, credential theft, or unauthorized actions performed on behalf of users. This can damage organizational reputation, lead to data breaches, and disrupt business operations, especially for entities relying heavily on WordPress for content management and customer engagement. Since contributors can inject malicious code, insider threats or compromised contributor accounts increase risk. The vulnerability does not directly affect availability but compromises confidentiality and integrity of user sessions and data. Organizations in sectors such as media, e-commerce, and public services that use WordPress extensively are particularly vulnerable. The medium severity score indicates a moderate but actionable risk that requires timely mitigation to prevent exploitation.

1. Immediately restrict contributor-level permissions to trusted users only and review existing contributor accounts for suspicious activity. 2. Implement strict input validation and output escaping for all shortcode attributes, especially 'bgcolor', to prevent injection of malicious scripts. 3. Monitor WordPress sites for unusual shortcode usage or unexpected script injections in page content. 4. Disable or remove the WordPress Content Flipper plugin if not essential until a patched version is released. 5. Employ Web Application Firewalls (WAFs) configured to detect and block XSS payloads targeting shortcode parameters. 6. Educate content contributors about security best practices and the risks of injecting untrusted content. 7. Regularly update WordPress core and plugins to incorporate security patches once available. 8. Conduct periodic security audits and penetration testing focused on plugin vulnerabilities and user privilege misuse.