CVE-2025-58620 is a medium severity Stored Cross-Site Scripting (XSS) vulnerability identified in the 'PDF for WPForms' add-on developed by add-ons.org. This vulnerability arises due to improper neutralization of input during web page generation, classified under CWE-79. Specifically, the affected versions up to 6.2.1 do not adequately sanitize or encode user-supplied input before rendering it in web pages, allowing attackers to inject malicious scripts that persist within the application. When a victim accesses the compromised page, the malicious script executes in their browser context, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The CVSS 3.1 base score of 6.5 reflects a medium severity, with an attack vector of network (AV:N), low attack complexity (AC:L), requiring low privileges (PR:L), and some user interaction (UI:R). The scope is changed (S:C), indicating that exploitation can affect resources beyond the vulnerable component. The impact includes low confidentiality, integrity, and availability impacts individually, but combined they can lead to significant security concerns. No known exploits are currently reported in the wild, and no patches have been linked yet. This vulnerability is particularly relevant for websites using WPForms with the PDF add-on, which is popular for generating PDFs from form submissions in WordPress environments.

For European organizations, especially those relying on WordPress with WPForms and the PDF for WPForms add-on, this vulnerability poses a risk of client-side attacks that can compromise user data confidentiality and integrity. Stored XSS can lead to session hijacking, enabling attackers to impersonate legitimate users, potentially accessing sensitive personal data protected under GDPR. Additionally, attackers could manipulate form data or perform unauthorized actions, undermining trust and compliance. The availability impact is generally limited but could be leveraged in combination with other vulnerabilities for broader attacks. Given the widespread use of WordPress in Europe and the popularity of WPForms among SMEs and enterprises for customer interaction, this vulnerability could affect sectors such as e-commerce, healthcare, finance, and public services. The requirement for low privileges and user interaction means that internal users or authenticated customers could be targeted, increasing the risk within organizational environments.

Organizations should immediately audit their WordPress installations to identify if the PDF for WPForms add-on is in use and determine the version. Until an official patch is released, administrators should consider disabling the PDF for WPForms add-on to eliminate the attack surface. Implementing Web Application Firewall (WAF) rules to detect and block typical XSS payloads targeting this plugin can provide interim protection. Additionally, enforcing Content Security Policy (CSP) headers can mitigate the impact of injected scripts by restricting script execution contexts. User input validation and output encoding should be reviewed and enhanced in customizations around WPForms. Monitoring logs for unusual user input patterns or script injections is recommended. Once a patch is available, prompt application of updates is critical. Educating users about the risks of interacting with suspicious links or forms can reduce successful exploitation via social engineering.