CVE-2024-11899 is a stored Cross-Site Scripting (XSS) vulnerability identified in the Slider Pro Lite plugin for WordPress, affecting all versions up to and including 1.4.1. The vulnerability stems from improper neutralization of input during web page generation, specifically in the handling of the 'sliderpro' shortcode attributes. The plugin fails to adequately sanitize and escape user-supplied input, allowing authenticated users with contributor-level permissions or higher to inject arbitrary JavaScript code into pages. This malicious code is stored persistently and executed in the context of any user who accesses the compromised page, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the victim. The vulnerability has a CVSS 3.1 base score of 6.4, reflecting medium severity, with an attack vector of network (remote exploitation), low attack complexity, requiring privileges (authenticated contributor or above), no user interaction, and a scope change (impacting other components or users). While no public exploits are currently known, the vulnerability's presence in a widely used WordPress plugin makes it a significant risk. The lack of patches or updates at the time of publication necessitates immediate mitigation efforts by site administrators.

The primary impact of CVE-2024-11899 is the compromise of confidentiality and integrity within affected WordPress sites using the Slider Pro Lite plugin. Attackers with contributor-level access can inject malicious scripts that execute in the browsers of site visitors and administrators, potentially leading to session hijacking, theft of sensitive information such as cookies or credentials, and unauthorized actions performed with the victim's privileges. This can facilitate further attacks like privilege escalation, data exfiltration, or site defacement. Although availability is not directly affected, the reputational damage and potential data breaches can have severe operational and financial consequences. Organizations relying on this plugin, especially those with multiple contributors or public-facing content, face increased risk of targeted attacks. The vulnerability's exploitation requires authenticated access, limiting exposure to internal or trusted users, but insider threats or compromised contributor accounts can be leveraged. The scope of impact extends to all visitors of infected pages, broadening the potential victim base.

1. Immediate mitigation involves restricting contributor-level access to trusted users only and reviewing existing user privileges to minimize risk. 2. Site administrators should monitor and audit content created via the 'sliderpro' shortcode for suspicious or unauthorized scripts. 3. Employ Web Application Firewalls (WAFs) with rules designed to detect and block common XSS payloads targeting WordPress plugins. 4. Implement Content Security Policy (CSP) headers to restrict the execution of inline scripts and reduce the impact of injected code. 5. Regularly update the Slider Pro Lite plugin once a patch is released by the vendor; until then, consider disabling or replacing the plugin with a secure alternative. 6. Conduct security awareness training for contributors to recognize and avoid introducing malicious content. 7. Use security plugins that scan for malicious code injections and anomalous behavior within WordPress environments. 8. Backup website data frequently to enable recovery in case of compromise.