CVE-2025-68607 identifies a stored Cross-site Scripting (XSS) vulnerability in the Hiroaki Miyashita Custom Field Template plugin, versions up to 2.7.5. This vulnerability is classified under CWE-79, which involves improper neutralization of input during web page generation. Specifically, the plugin fails to adequately sanitize or encode user-supplied input before rendering it on web pages, allowing attackers to inject malicious scripts that persist in the application’s stored data. When other users access the affected pages, these scripts execute in their browsers, potentially compromising session tokens, redirecting users, or performing unauthorized actions. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) indicates that the attack can be launched remotely over the network with low attack complexity, requires low privileges (authenticated user), and user interaction (e.g., clicking a link) is necessary. The scope is changed, meaning the vulnerability can affect resources beyond the initially vulnerable component. Confidentiality, integrity, and availability impacts are all rated low but present. No patches or known exploits are currently available, but the vulnerability’s presence in a widely used plugin for content management systems or web applications makes it a notable risk. The vulnerability was published on December 29, 2025, and assigned by Patchstack. The plugin’s role in managing custom fields suggests it is integrated into various web platforms, increasing the attack surface.

For European organizations, this vulnerability poses risks primarily to web applications that utilize the Hiroaki Miyashita Custom Field Template plugin for managing custom fields. Successful exploitation can lead to session hijacking, theft of sensitive user data, unauthorized actions performed on behalf of users, and defacement of web content. This can damage organizational reputation, lead to regulatory non-compliance (e.g., GDPR breaches due to data exposure), and disrupt business operations. Since the vulnerability requires authenticated access and user interaction, insider threats or compromised user accounts could be leveraged to exploit it. The impact is particularly significant for organizations with multi-user environments such as e-commerce platforms, content management systems, and customer portals. Given the medium severity and the potential for cross-site scripting to be chained with other attacks, European entities must prioritize mitigation to prevent lateral movement and data leakage.

1. Immediately audit and inventory all web applications using the Hiroaki Miyashita Custom Field Template plugin to identify affected instances. 2. Restrict access to the plugin’s functionality to trusted users only, minimizing the risk of malicious input. 3. Implement strict input validation and output encoding on all user-supplied data fields managed by the plugin, using context-aware encoding to neutralize scripts. 4. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers. 5. Monitor web application logs and user activity for signs of attempted or successful XSS exploitation, such as unusual script injections or anomalous user behavior. 6. Prepare for timely deployment of patches or updates once the vendor releases a fix; subscribe to vendor advisories and Patchstack notifications. 7. Educate users and administrators about the risks of XSS and the importance of cautious interaction with links or content from untrusted sources. 8. Consider deploying Web Application Firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting this plugin. 9. Regularly review and update security policies related to web application development and plugin usage to incorporate lessons learned from this vulnerability.