CVE-2024-50452 is a stored cross-site scripting (XSS) vulnerability identified in the POSIMYTH Nexter Blocks plugin for WordPress, specifically versions up to 3.3.3. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, allowing malicious scripts to be embedded and persist within the content generated by the plugin. Stored XSS is particularly dangerous because the malicious payload is saved on the server and served to all users who access the affected page, increasing the attack surface. An attacker exploiting this vulnerability can execute arbitrary JavaScript in the context of the victim's browser, potentially leading to session hijacking, credential theft, defacement, or distribution of malware. The vulnerability does not require authentication, making it accessible to unauthenticated attackers. Although no known exploits have been reported in the wild, the presence of this vulnerability in a widely used WordPress plugin poses a significant risk. The plugin is used to enhance the block editor experience, and its presence on public-facing websites means that a successful exploit could affect a broad user base. The lack of a CVSS score indicates that the vulnerability is newly disclosed and pending further analysis. The vulnerability was reserved in October 2024 and published in February 2026, indicating a recent discovery and disclosure timeline.

The impact of CVE-2024-50452 is significant for organizations using the POSIMYTH Nexter Blocks plugin in their WordPress environments. Successful exploitation can lead to the execution of arbitrary scripts in users' browsers, compromising user sessions and potentially allowing attackers to steal sensitive information such as authentication tokens or personal data. This can result in unauthorized access to user accounts, defacement of websites, or the spread of malware to site visitors. For e-commerce sites or portals handling sensitive transactions, this can lead to financial losses and reputational damage. Additionally, the stored nature of the XSS means that every visitor to the compromised page is at risk, amplifying the potential damage. The vulnerability affects the integrity and confidentiality of data and can indirectly affect availability if the site is defaced or taken offline to remediate the issue. Given the widespread use of WordPress and the popularity of block editor plugins, the scope of affected systems is broad, increasing the potential global impact.

To mitigate CVE-2024-50452, organizations should take the following specific actions: 1) Monitor POSIMYTH’s official channels for patches addressing this vulnerability and apply updates promptly once available. 2) In the interim, restrict or sanitize user inputs that interact with the Nexter Blocks plugin, especially inputs that are rendered on public pages. 3) Deploy and configure a Web Application Firewall (WAF) with rules specifically targeting XSS attacks to detect and block malicious payloads. 4) Conduct thorough code reviews and security testing on customizations involving the plugin to identify and remediate unsafe input handling. 5) Educate content editors and administrators about the risks of injecting untrusted content and enforce strict content moderation policies. 6) Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 7) Regularly audit website logs for unusual activities indicative of attempted or successful XSS exploitation. These measures, combined, reduce the risk of exploitation until a vendor patch is applied.