CVE-2024-51576 is a stored cross-site scripting (XSS) vulnerability found in the wpza AMP Img Shortcode plugin, specifically in versions up to 1.0.1. The vulnerability is caused by improper neutralization of input during the generation of web pages, which allows attackers to inject malicious scripts that are stored and later executed in the context of users visiting the affected website. Stored XSS vulnerabilities are particularly dangerous because the malicious payload persists on the server and can affect multiple users without requiring repeated exploitation. The wpza AMP Img Shortcode plugin is used to embed AMP-compatible images in WordPress sites, and the vulnerability likely stems from insufficient sanitization or encoding of shortcode attributes or parameters before rendering them in the HTML output. Attackers can exploit this flaw by submitting crafted input through the shortcode parameters, which the plugin then outputs without proper escaping, enabling script execution in visitors' browsers. This can lead to session hijacking, credential theft, defacement, or distribution of malware. The vulnerability does not require authentication, making it accessible to unauthenticated attackers, and no user interaction beyond visiting a compromised page is necessary to trigger the payload. Although no public exploits are currently known, the vulnerability is published and should be considered a serious risk for websites using this plugin. No CVSS score has been assigned yet, but the nature of the vulnerability and its impact warrant a high severity rating. The plugin's user base is primarily WordPress sites that implement AMP images, which are common globally, increasing the potential attack surface.

The impact of CVE-2024-51576 is significant for organizations running WordPress sites with the vulnerable wpza AMP Img Shortcode plugin. Successful exploitation can lead to the execution of arbitrary JavaScript in the context of site visitors, compromising user confidentiality and integrity. Attackers can steal cookies, session tokens, or other sensitive information, potentially leading to account takeover or unauthorized actions on behalf of users. Additionally, attackers may deface websites or redirect users to malicious sites, damaging organizational reputation and trust. The persistent nature of stored XSS means that once injected, the malicious script affects all visitors until the vulnerability is remediated, amplifying the risk. This can also facilitate further attacks such as phishing or malware distribution. The vulnerability affects availability indirectly by potentially causing site administrators to take sites offline to remediate or due to reputational damage. Given the widespread use of WordPress and AMP technologies, a large number of websites globally could be impacted, especially those that rely on this specific plugin for AMP image embedding.

To mitigate CVE-2024-51576, organizations should immediately update the wpza AMP Img Shortcode plugin to a version that addresses the vulnerability once available. In the absence of an official patch, administrators should consider disabling or removing the plugin to eliminate the attack vector. Implement strict input validation and output encoding for all shortcode parameters, ensuring that any user-supplied data is properly sanitized before rendering in HTML. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts on affected sites. Regularly audit and monitor web application logs for suspicious input patterns or unexpected script injections. Educate site administrators and developers on secure coding practices related to shortcode handling and AMP content generation. Additionally, use web application firewalls (WAFs) configured to detect and block XSS payloads targeting shortcode parameters. Finally, conduct thorough security testing, including automated scanning and manual penetration testing, to identify and remediate similar vulnerabilities proactively.