CVE-2024-11888 is a stored cross-site scripting vulnerability classified under CWE-79, affecting the IDer Login for WordPress plugin in all versions up to and including 2.1. The vulnerability stems from insufficient input sanitization and output escaping of user-supplied attributes in the plugin's 'ider_login_button' shortcode. This flaw allows authenticated attackers with contributor-level privileges or higher to inject arbitrary JavaScript code into WordPress pages. When other users access these pages, the malicious scripts execute in their browsers, potentially leading to session hijacking, privilege escalation, or unauthorized actions within the WordPress environment. The vulnerability has a CVSS 3.1 base score of 6.4, reflecting a medium severity level. The attack vector is network-based with low attack complexity, requiring privileges but no user interaction. The scope is changed, meaning the vulnerability can affect components beyond the initially compromised user. No known public exploits or patches are currently available. The vulnerability highlights the importance of rigorous input validation and output encoding in WordPress plugin development to prevent script injection attacks.

The primary impact of CVE-2024-11888 is on the confidentiality and integrity of WordPress sites using the IDer Login plugin. Successful exploitation can lead to theft of user credentials, session tokens, or other sensitive information through malicious script execution. Attackers may also perform unauthorized actions on behalf of other users, potentially escalating privileges or defacing content. While availability is not directly affected, the reputational damage and potential data breaches can have significant 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 could be leveraged in broader attack campaigns to compromise WordPress ecosystems, particularly in environments where contributor-level access is common.

To mitigate CVE-2024-11888, organizations should immediately restrict contributor-level access to trusted users only until a patch is available. Developers and administrators should implement strict input validation and output encoding on all user-supplied data, especially within shortcode attributes. Employing security plugins that provide web application firewall (WAF) capabilities can help detect and block malicious payloads targeting this vulnerability. Monitoring logs for unusual script injections or unauthorized content changes is critical. Regularly updating WordPress core and plugins, and subscribing to vendor security advisories, will ensure timely application of patches once released. Additionally, conducting security audits and penetration testing focused on plugin vulnerabilities can identify similar issues proactively. Disabling or removing the IDer Login plugin temporarily may be necessary in high-risk environments.