CVE-2025-62937 is a stored cross-site scripting (XSS) vulnerability identified in the Johnny Post List Featured Image plugin, specifically in the post-list-featured-image component. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, allowing attackers to inject malicious JavaScript code that is stored persistently within the application. When other users or administrators view the affected pages, the malicious script executes in their browsers within the context of the vulnerable site. This can lead to session hijacking, theft of sensitive information, unauthorized actions performed on behalf of users, and potential site defacement. The affected versions include all releases up to and including 0.5.9, with no patch currently available as of the publication date (October 27, 2025). No authentication or user interaction beyond page viewing is required to exploit this vulnerability, increasing its risk profile. Although no known exploits have been reported in the wild, the vulnerability's nature and persistence make it a significant threat. The lack of a CVSS score necessitates an assessment based on impact and exploitability factors. Stored XSS vulnerabilities are commonly targeted by attackers due to their ability to affect multiple users and bypass some traditional security controls. The vulnerability was assigned by Patchstack and is publicly disclosed in the CVE database, indicating recognition by the security community and the need for remediation.

For European organizations, the impact of CVE-2025-62937 can be substantial, especially for those relying on WordPress sites utilizing the Johnny Post List Featured Image plugin. Exploitation could lead to unauthorized access to user sessions, enabling attackers to impersonate legitimate users or administrators. This can result in data breaches involving personal data, intellectual property, or confidential business information, violating GDPR and other data protection regulations. The integrity of website content may be compromised, damaging organizational reputation and trust. Additionally, attackers could use the vulnerability as a foothold for further attacks within the network or to distribute malware to site visitors. The availability of the affected service could also be indirectly impacted if the site is defaced or taken offline to remediate the issue. Given the widespread use of WordPress across Europe, organizations in sectors such as e-commerce, media, government, and education are particularly at risk. The absence of known exploits currently provides a window for proactive mitigation before active exploitation occurs.

1. Monitor official channels for patches or updates from the Johnny plugin developers and apply them immediately once released. 2. Implement strict input validation and sanitization on all user-supplied data to prevent malicious script injection. 3. Employ robust output encoding techniques when rendering data to web pages to neutralize any injected scripts. 4. Configure Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. 5. Conduct regular security audits and code reviews of plugins and themes to identify and remediate similar vulnerabilities. 6. Limit plugin usage to trusted and actively maintained components, removing or replacing outdated or unsupported plugins. 7. Educate site administrators and users about the risks of XSS and encourage vigilance for suspicious site behavior. 8. Utilize web application firewalls (WAFs) with rules designed to detect and block XSS attack patterns. 9. Backup website data regularly to enable quick restoration in case of compromise. 10. Consider implementing multi-factor authentication (MFA) for administrative access to reduce the risk of account takeover.