CVE-2024-13732 is a stored cross-site scripting vulnerability identified in the Responsive Blocks – WordPress Gutenberg Blocks plugin, which is widely used to add responsive content blocks within WordPress sites. The vulnerability stems from insufficient sanitization and escaping of the 'section_tag' parameter during web page generation. This parameter can be manipulated by authenticated users with Contributor-level permissions or higher to inject arbitrary JavaScript code into pages. Because the malicious script is stored persistently, it executes in the context of any user who views the infected page, potentially compromising user sessions, stealing cookies, or performing unauthorized actions on behalf of users. The vulnerability affects all versions up to and including 1.9.9 of the plugin. The CVSS 3.1 score is 6.4, reflecting a medium severity with network attack vector, low attack complexity, requiring privileges but no user interaction, and impacting confidentiality and integrity with a scope change. No patches or official fixes have been linked yet, and no known exploits are reported in the wild. The vulnerability is classified under CWE-79, indicating improper neutralization of input during web page generation. This flaw is particularly dangerous in multi-user WordPress environments where contributors can add content but are not fully trusted. Attackers exploiting this vulnerability can escalate their impact by targeting site administrators or other privileged users who view the injected content.

The impact of CVE-2024-13732 is significant for organizations running WordPress sites with the vulnerable Responsive Blocks plugin installed. Exploitation allows authenticated contributors or higher to execute persistent malicious scripts, which can lead to session hijacking, theft of sensitive information, unauthorized actions performed on behalf of users, and potential site defacement. This undermines the confidentiality and integrity of the website and its users. Since the vulnerability requires contributor-level access, attackers must first compromise or register an account with such privileges, which may be easier in sites with weak user management or open registrations. The scope of affected systems is broad given the popularity of WordPress and the plugin. Although availability is not directly impacted, the reputational damage and potential data breaches can be severe. Organizations with high-value targets, such as e-commerce, government, or media websites, face elevated risks. The lack of known exploits in the wild suggests limited current exploitation but also highlights the importance of proactive mitigation before attackers develop weaponized payloads.

To mitigate CVE-2024-13732, organizations should first check for updates from the plugin vendor and apply any available patches promptly once released. In the absence of official patches, administrators should consider temporarily disabling or removing the Responsive Blocks plugin to eliminate the attack vector. Restricting user roles and permissions is critical; ensure that only trusted users have Contributor-level or higher access, and review user accounts for suspicious activity. Implementing a Web Application Firewall (WAF) with rules to detect and block malicious script injections targeting the 'section_tag' parameter can provide interim protection. Additionally, site administrators should enable Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts. Regular security audits and monitoring for unusual user behavior or injected content are recommended. Educating content contributors about safe input practices and monitoring plugin usage can further reduce risk. Finally, consider alternative plugins with better security track records if the vendor does not provide timely fixes.