CVE-2025-58822 is a medium-severity vulnerability classified under CWE-79, which pertains to improper neutralization of input during web page generation, commonly known as Cross-site Scripting (XSS). Specifically, this vulnerability affects the WP Mail plugin developed by mndpsingh287, up to version 1.3. The flaw allows for DOM-based XSS attacks, where malicious scripts can be injected and executed in the context of a user's browser when interacting with the affected plugin. This occurs because the plugin fails to properly sanitize or encode user-supplied input before incorporating it into the web page's Document Object Model (DOM). The vulnerability has a CVSS v3.1 base score of 6.5, indicating a medium severity level. The vector string (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) shows that the attack can be performed remotely over the network with low attack complexity, requires low privileges but does require user interaction, and impacts confidentiality, integrity, and availability to a limited extent. The scope is changed, meaning the vulnerability affects components beyond the initially vulnerable component. No known exploits are currently reported in the wild, and no patches have been published yet. The vulnerability was publicly disclosed on September 5, 2025. Given that WP Mail is a WordPress plugin, it is likely used by website administrators to manage email functionalities within WordPress sites. The DOM-based XSS can be exploited by tricking authenticated users (such as site admins or editors) into clicking malicious links or visiting crafted pages, potentially leading to session hijacking, privilege escalation, or unauthorized actions within the WordPress environment.

For European organizations, the exploitation of this DOM-based XSS vulnerability in WP Mail can lead to significant security risks, especially for entities relying on WordPress for their web presence. Successful exploitation could allow attackers to execute arbitrary scripts in the context of authenticated users, potentially leading to theft of session cookies, defacement of websites, unauthorized email sending, or further pivoting into internal networks. This can compromise the confidentiality of sensitive data, integrity of website content, and availability of email-related functionalities. Organizations in sectors such as finance, healthcare, government, and e-commerce, which often use WordPress for customer-facing portals or internal communication, may face reputational damage, regulatory penalties under GDPR if personal data is exposed, and operational disruptions. The requirement for user interaction and low privilege means that social engineering or phishing campaigns targeting site administrators could facilitate exploitation. Given the widespread use of WordPress across Europe, the risk is non-trivial, especially for organizations with limited security monitoring or outdated plugin management practices.

To mitigate this vulnerability effectively, European organizations should: 1) Immediately audit their WordPress installations to identify the presence of the WP Mail plugin and verify its version. 2) Apply any available patches or updates from the plugin developer as soon as they are released. In the absence of official patches, consider temporarily disabling or uninstalling the WP Mail plugin to eliminate exposure. 3) Implement Web Application Firewall (WAF) rules that detect and block suspicious input patterns indicative of XSS attacks targeting the plugin's endpoints. 4) Enforce strict Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 5) Educate site administrators and users about the risks of clicking on untrusted links and the importance of verifying URLs before interaction. 6) Regularly monitor web server and application logs for unusual activity or repeated attempts to exploit XSS vulnerabilities. 7) Employ security plugins or tools that scan for known vulnerabilities and anomalous behavior within WordPress environments. 8) Review and harden user privileges to minimize the impact of compromised accounts, ensuring the principle of least privilege is applied.