CVE-2025-28923 identifies a Cross-Site Request Forgery (CSRF) vulnerability in the 'No Disposable Email' plugin developed by philippe, specifically affecting versions up to and including 2.5.1. The vulnerability enables an attacker to trick an authenticated user into submitting unwanted requests to the vulnerable web application, leveraging the user's credentials and session context. This CSRF flaw is compounded by the presence of Stored Cross-Site Scripting (XSS), where malicious scripts injected by the attacker are persistently stored on the server and executed in the context of other users' browsers. The combination of CSRF and Stored XSS significantly increases the attack surface, allowing attackers to perform unauthorized actions, steal sensitive information such as session cookies, or manipulate application data. The plugin is typically used to prevent disposable or temporary email addresses during user registration or form submissions, making it a common component in web applications that require email validation. No public exploits have been reported yet, but the vulnerability is published and should be considered exploitable given the nature of CSRF and Stored XSS attacks. The lack of a CVSS score indicates that the severity must be assessed based on the potential impact and exploitability. The vulnerability does not require user interaction beyond the victim being authenticated and visiting a malicious page, which lowers the barrier for exploitation. The absence of patch links suggests that remediation may require vendor updates or manual mitigation steps.

The impact of CVE-2025-28923 is significant for organizations using the 'No Disposable Email' plugin in their web applications. Exploitation can lead to unauthorized actions performed under the guise of legitimate users, including changes to user data, unauthorized transactions, or privilege escalation. The Stored XSS component can result in persistent malicious code execution, enabling attackers to hijack user sessions, steal credentials, or deliver malware. This can compromise the confidentiality, integrity, and availability of affected systems and user data. Organizations may face data breaches, reputational damage, and regulatory penalties if sensitive information is exposed. Since the vulnerability affects a plugin commonly used in web forms and user registration processes, a wide range of industries including e-commerce, SaaS providers, and online communities could be impacted. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits once the vulnerability details are public. The ease of exploitation, requiring only an authenticated user and no complex prerequisites, increases the likelihood of successful attacks in targeted environments.

To mitigate CVE-2025-28923, organizations should prioritize updating the 'No Disposable Email' plugin to a version where this vulnerability is patched once available. In the absence of an official patch, implement strict anti-CSRF protections such as synchronizer tokens or double-submit cookies to ensure that all state-changing requests are validated. Review and harden input validation and output encoding mechanisms to prevent Stored XSS, including sanitizing all user-supplied data before storage and rendering. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts. Conduct thorough security testing on web forms and user input handling components. Additionally, monitor web application logs for unusual activities that may indicate exploitation attempts. Educate users about phishing and social engineering tactics that could be used to trigger CSRF attacks. Finally, consider deploying Web Application Firewalls (WAFs) with rules designed to detect and block CSRF and XSS attack patterns targeting this plugin.