CVE-2025-62761 identifies a stored Cross-site Scripting (XSS) vulnerability in the BasePress Knowledge Base documentation & wiki plugin, a popular WordPress plugin used to create and manage documentation and wiki content. The vulnerability is classified under CWE-79, indicating improper neutralization of input during web page generation. Specifically, the plugin fails to adequately sanitize or encode user-supplied input before rendering it in web pages, allowing attackers to inject malicious JavaScript code that is stored persistently. This stored XSS can be triggered when other users view the affected pages, potentially leading to session hijacking, credential theft, or unauthorized actions performed in the context of the victim’s browser session. The vulnerability affects all versions up to 2.17.0.1, with no earlier version specified. The CVSS v3.1 score is 6.5, indicating medium severity, with an attack vector of network (remote exploitation), low attack complexity, requiring privileges (PR:L) and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. Confidentiality, integrity, and availability impacts are all rated low, reflecting partial compromise rather than full system takeover. No public exploits or active exploitation in the wild have been reported as of the published date. The vulnerability was reserved in October 2025 and published at the end of 2025, suggesting recent discovery and disclosure. The plugin is widely used in WordPress environments for knowledge base and wiki functionality, making it a relevant target for attackers seeking to leverage stored XSS for lateral movement or data exfiltration.

For European organizations, the impact of CVE-2025-62761 can be significant, especially for those relying on BasePress for internal or customer-facing documentation and knowledge management. Stored XSS vulnerabilities can lead to unauthorized access to sensitive information, session hijacking, and the potential spread of malware or phishing attacks within the organization’s user base. This can undermine trust in corporate portals and lead to data breaches involving personal or proprietary information. The partial compromise of confidentiality, integrity, and availability can disrupt business operations and compliance with data protection regulations such as GDPR. Organizations with large user bases or those in regulated sectors (finance, healthcare, government) face heightened risks due to potential exposure of sensitive data and reputational damage. Additionally, attackers could leverage this vulnerability as a foothold to escalate privileges or move laterally within the network, increasing the overall threat landscape.

To mitigate CVE-2025-62761 effectively, European organizations should: 1) Monitor BasePress plugin updates closely and apply patches immediately once available, as no official patch links are currently provided. 2) Implement strict input validation and output encoding on all user-generated content within the knowledge base to prevent malicious script injection. 3) Employ Content Security Policies (CSP) to restrict the execution of unauthorized scripts and reduce the impact of potential XSS payloads. 4) Limit privileges for users who can submit or edit content in the BasePress plugin to trusted personnel only, reducing the risk of malicious input. 5) Conduct regular security audits and penetration testing focused on web application vulnerabilities, including XSS. 6) Educate users about the risks of clicking on suspicious links or interacting with untrusted content within internal portals. 7) Consider deploying Web Application Firewalls (WAFs) with rules tailored to detect and block XSS attack patterns targeting BasePress. 8) Maintain comprehensive logging and monitoring to detect anomalous activities that may indicate exploitation attempts.