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 WordPress plugin 'WP Mail' developed by mndpsingh287, up to version 1.3. The flaw is a DOM-based XSS, meaning that malicious scripts are executed in the victim's browser by manipulating the Document Object Model (DOM) environment, rather than through server-side injection. This type of XSS occurs when client-side scripts write user-controllable data to the DOM without proper sanitization or encoding, allowing attackers to execute arbitrary JavaScript in the context of the affected site. The CVSS v3.1 score is 6.5, indicating a medium severity level, with the vector string AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L. This means the attack can be launched remotely over the network with low attack complexity, requires low privileges and user interaction, and impacts confidentiality, integrity, and availability to a limited extent. The scope is changed, indicating that the vulnerability affects components beyond the initially vulnerable component. No known exploits are currently reported in the wild, and no patches or fixes have been linked yet. The vulnerability can allow an attacker to steal sensitive information such as cookies or session tokens, perform actions on behalf of authenticated users, or disrupt availability by injecting malicious scripts. Since WP Mail is a WordPress plugin used to manage email functionalities, exploitation could lead to unauthorized access to user accounts or manipulation of email-related features within WordPress sites.

For European organizations, this vulnerability poses a significant risk especially for those relying on WordPress websites with the WP Mail plugin installed. The ability to execute DOM-based XSS can lead to session hijacking, credential theft, or unauthorized actions performed under the guise of legitimate users. This can compromise the confidentiality and integrity of user data and potentially disrupt business operations. Organizations in sectors such as e-commerce, finance, healthcare, and government, which often use WordPress for public-facing websites or internal portals, could face reputational damage, regulatory penalties under GDPR for data breaches, and operational downtime. The medium severity score suggests that while exploitation requires some user interaction and low privileges, the consequences can still be impactful, especially if combined with social engineering. Since no known exploits are currently active, proactive mitigation is critical to prevent future attacks. The vulnerability's scope change indicates that the impact could extend beyond the plugin itself, potentially affecting other components or user sessions.

European organizations should immediately audit their WordPress installations to identify the presence of the WP Mail plugin, particularly versions up to 1.3. Until an official patch is released, organizations should consider disabling or uninstalling the plugin to eliminate the attack vector. Web application firewalls (WAFs) should be configured to detect and block suspicious DOM-based XSS payloads targeting the plugin's known parameters or endpoints. Developers and administrators should implement strict Content Security Policies (CSP) to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. Additionally, user input validation and output encoding should be reviewed and enhanced in custom code interacting with the plugin. Monitoring web traffic and logs for unusual activity or attempted exploitation attempts is recommended. Organizations should also educate users about the risks of interacting with suspicious links or content that could trigger XSS attacks. Once a patch becomes available from the vendor, prompt application of the update is essential. Finally, regular security assessments and penetration testing focusing on client-side vulnerabilities can help detect similar issues proactively.