CVE-2025-62983 is a stored Cross-site Scripting (XSS) vulnerability identified in the Sudar Muthu Posts By Tag WordPress plugin, affecting all versions up to and including 3.2.1. This vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, allowing malicious scripts to be stored persistently within the application. When other users access the compromised pages, the injected scripts execute in their browsers, potentially leading to session hijacking, unauthorized actions, or data theft. The vulnerability requires an attacker to have at least limited privileges (PR:L) and some user interaction (UI:R) to exploit, but no physical access or complex conditions are needed. The CVSS v3.1 base score of 6.5 reflects a medium severity, with network attack vector (AV:N), low attack complexity (AC:L), and a scope change (S:C), indicating that the vulnerability can affect components beyond the initially vulnerable module. The impacts include partial loss of confidentiality, integrity, and availability, as malicious scripts can manipulate content, steal sensitive information, or disrupt service. No known exploits are currently reported in the wild, but the vulnerability's presence in a popular WordPress plugin used widely for content tagging and display increases the risk of exploitation. The lack of available patches at the time of publication necessitates proactive mitigation steps. The vulnerability is cataloged and published by Patchstack and the CVE database, with a reserved date of October 24, 2025, and publication on October 27, 2025.

For European organizations, this vulnerability poses a significant risk to websites using the Posts By Tag plugin, particularly those relying on WordPress for content management. Exploitation can lead to unauthorized access to user sessions, defacement of web pages, and potential data leakage, undermining user trust and regulatory compliance such as GDPR. The stored nature of the XSS means that once injected, malicious scripts persist and can affect multiple users, increasing the attack surface. This can disrupt business operations, damage brand reputation, and lead to financial losses. Organizations with customer-facing portals or internal dashboards using this plugin are especially vulnerable. Additionally, the scope change indicated in the CVSS vector suggests that the impact could extend beyond the plugin itself, potentially affecting other integrated components or services. The requirement for limited privileges and user interaction means insider threats or compromised accounts could facilitate exploitation. Given the widespread use of WordPress in Europe, the threat is relevant across multiple sectors including e-commerce, media, education, and government services.

1. Monitor official sources for patches or updates from Sudar Muthu and apply them immediately upon release. 2. Implement strict input validation and output encoding on all user-supplied data, especially in the Posts By Tag plugin context, to prevent injection of malicious scripts. 3. Restrict user privileges to the minimum necessary, reducing the risk that attackers can inject malicious content. 4. Employ Web Application Firewalls (WAFs) with rules designed to detect and block XSS payloads targeting this plugin. 5. Conduct regular security audits and code reviews of customizations involving the Posts By Tag plugin. 6. Educate users and administrators about the risks of XSS and the importance of cautious interaction with untrusted content. 7. Monitor logs and user activity for signs of exploitation attempts or unusual behavior. 8. Consider temporary disabling or replacing the plugin with a more secure alternative until patches are available. 9. Use Content Security Policy (CSP) headers to limit the execution of unauthorized scripts on affected web pages. 10. Backup website data regularly to enable quick recovery in case of compromise.