CVE-2024-50540 identifies a stored cross-site scripting (XSS) vulnerability in the (dp) AddThis plugin developed by demixpress, affecting versions up to 1.0.2. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious JavaScript code that is stored persistently on the server and served to other users. When victims access the compromised pages, the injected script executes in their browsers within the security context of the affected site. This can lead to a range of attacks including session hijacking, theft of cookies or credentials, defacement, and distribution of malware. The vulnerability does not require authentication or user interaction beyond visiting the infected page, increasing its exploitation potential. Although no public exploits have been reported yet, the presence of stored XSS in a widely used social sharing plugin is concerning. The lack of a CVSS score indicates that the vulnerability is newly disclosed and may not yet have an official severity rating. The plugin’s role in embedding social sharing features means many websites could be affected, especially those that have not updated beyond version 1.0.2. The vulnerability was reserved in late October 2024 and published in November 2024, indicating recent discovery. No official patches or mitigation links are currently provided, emphasizing the need for immediate attention from users of the plugin.

The impact of CVE-2024-50540 is significant for organizations using the (dp) AddThis plugin on their websites. Successful exploitation allows attackers to execute arbitrary JavaScript in the context of the affected site, potentially leading to user session hijacking, theft of sensitive information such as cookies and credentials, unauthorized actions performed on behalf of users, and website defacement. This can erode user trust, damage brand reputation, and lead to regulatory compliance issues if user data is compromised. Since the vulnerability is stored XSS, the malicious payload persists and can affect multiple users over time. The ease of exploitation without authentication or complex prerequisites increases the risk of widespread abuse. Organizations with high-traffic websites or those handling sensitive user data are at greater risk. Additionally, attackers could leverage this vulnerability as a foothold for further attacks, including phishing or malware distribution. The absence of known exploits in the wild currently reduces immediate risk but does not diminish the potential severity once exploitation tools become available.

To mitigate CVE-2024-50540, organizations should first verify if they are using the (dp) AddThis plugin version 1.0.2 or earlier and plan to upgrade to a patched version once available. In the absence of an official patch, immediate steps include implementing strict input validation and output encoding on all user-supplied data processed by the plugin to neutralize potentially malicious scripts. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. Regularly audit and sanitize stored content to detect and remove any injected malicious code. Disable or remove the plugin if it is not essential to reduce the attack surface. Monitor web server logs and user reports for suspicious activity indicative of exploitation attempts. Educate web developers and administrators about secure coding practices to prevent similar vulnerabilities. Finally, maintain up-to-date backups and incident response plans to quickly recover from any successful attacks.