CVE-2025-50040 is a stored Cross-site Scripting (XSS) vulnerability identified in the moshensky CF7 Spreadsheets plugin, affecting versions up to 2.3.2. This vulnerability arises due to improper neutralization of input during web page generation (CWE-79), allowing malicious actors to inject and store arbitrary scripts within the application. When a victim accesses the affected page, the malicious script executes in their browser context. The vulnerability requires low attack complexity (AC:L), but does require privileges (PR:L) and user interaction (UI:R) to trigger. The scope is changed (S:C), meaning the vulnerability can affect resources beyond the vulnerable component. The CVSS 3.1 base score is 6.5 (medium severity), reflecting limited confidentiality, integrity, and availability impacts but with potential for session hijacking, defacement, or further exploitation. No known exploits are currently reported in the wild, and no patches are linked yet. Stored XSS vulnerabilities are particularly dangerous as they persist on the server and can affect multiple users. The vulnerability is present in a WordPress plugin used to integrate spreadsheet functionality with Contact Form 7, a popular form plugin, which suggests a web-facing attack surface.

For European organizations, this vulnerability poses a significant risk especially for those using WordPress sites with the CF7 Spreadsheets plugin. Attackers exploiting this flaw could execute arbitrary JavaScript in the context of authenticated users, potentially leading to session hijacking, unauthorized actions, or data theft. This can compromise user privacy and organizational data integrity. The impact is heightened for organizations handling sensitive customer data or operating in regulated sectors such as finance, healthcare, or government. Additionally, the vulnerability could be leveraged for phishing or delivering malware via the compromised website. Given the widespread use of WordPress in Europe, and the popularity of Contact Form 7, many SMEs and larger enterprises could be exposed. The requirement for some privileges and user interaction limits mass exploitation but targeted attacks remain a concern. The vulnerability could also damage organizational reputation and lead to regulatory penalties under GDPR if personal data is compromised.

Organizations should immediately audit their WordPress installations for the presence of the moshensky CF7 Spreadsheets plugin and verify the version in use. Until an official patch is released, consider disabling or removing the plugin to eliminate exposure. Implement strict input validation and output encoding on all user-supplied data, especially in form inputs and spreadsheet data rendering. Employ Content Security Policy (CSP) headers to restrict script execution and reduce XSS impact. Monitor web logs for suspicious activity indicative of XSS exploitation attempts. Educate users about the risks of interacting with untrusted content on the site. Once a patch is available, apply it promptly. Additionally, consider deploying Web Application Firewalls (WAFs) with rules to detect and block XSS payloads targeting this plugin. Regularly update all WordPress components to minimize exposure to known vulnerabilities.