CVE-2025-62983 is a stored Cross-site Scripting (XSS) vulnerability identified in the Sudar Muthu 'Posts By Tag' WordPress plugin, affecting versions up to and including 3.2.1. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows an attacker to inject malicious JavaScript code that is stored persistently on the affected site. When other users, particularly those with authenticated sessions, view the compromised content, the malicious script executes in their browsers within the security context of the vulnerable site. This can lead to unauthorized actions such as session hijacking, defacement, or redirection to malicious sites. The CVSS 3.1 vector indicates that the attack can be performed remotely over the network (AV:N) with low attack complexity (AC:L), requires low privileges (PR:L), and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects components beyond the initially vulnerable component. The impact affects confidentiality, integrity, and availability to a limited extent (C:L/I:L/A:L). No public exploits are currently known, but the vulnerability is published and should be addressed promptly. The plugin is commonly used in WordPress environments to display posts filtered by tags, making it a target for attackers seeking to exploit popular content management systems.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on WordPress-based websites for content delivery, e-commerce, or customer engagement. Exploitation could lead to theft of user credentials, unauthorized actions performed on behalf of users, defacement of websites, or distribution of malware through injected scripts. This can damage brand reputation, result in regulatory non-compliance (e.g., GDPR breaches due to data exposure), and cause operational disruptions. Since the vulnerability requires low privileges but user interaction, phishing campaigns or social engineering could be used to maximize impact. Organizations with public-facing WordPress sites that utilize the Posts By Tag plugin are particularly at risk. The medium severity rating suggests that while the vulnerability is not critical, it still poses a meaningful threat that should not be ignored.

1. Monitor the Sudar Muthu plugin repository and official channels for patches addressing CVE-2025-62983 and apply updates immediately upon release. 2. Until a patch is available, implement Web Application Firewall (WAF) rules to detect and block suspicious input patterns targeting the Posts By Tag plugin. 3. Employ strict input validation and output encoding on all user-supplied data, especially in tag-related inputs, to prevent script injection. 4. Configure Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS payloads. 5. Conduct regular security audits and penetration testing focused on WordPress plugins and custom code handling user inputs. 6. Educate site administrators and users about the risks of phishing and social engineering that could leverage this vulnerability. 7. Limit user privileges to the minimum necessary to reduce the risk posed by low-privilege attackers. 8. Consider disabling or replacing the Posts By Tag plugin with alternatives that have a stronger security track record if immediate patching is not feasible.