CVE-2025-52733 is a Cross-site Scripting (XSS) vulnerability classified under CWE-79, specifically a DOM-Based XSS issue found in the ANON::form embedded secure form component developed by Anonform Ab. This vulnerability arises from improper neutralization of input during web page generation, allowing malicious scripts to be injected and executed within the context of a user's browser session. The affected product versions include all versions up to 1.7, with no specific lower bound version identified. The vulnerability enables an attacker with low privileges (PR:L) to exploit the system remotely (AV:N) with low attack complexity (AC:L), but requires user interaction (UI:R) such as clicking a crafted link or submitting a malicious form. The scope of the vulnerability is classified as changed (S:C), indicating that exploitation can affect resources beyond the vulnerable component. The impact includes low confidentiality, integrity, and availability losses (C:L/I:L/A:L), meaning that attackers can potentially steal or manipulate data and disrupt service availability to some extent. The vulnerability does not currently have known exploits in the wild, and no official patches have been released as of the publication date (June 20, 2025). The vulnerability is significant because ANON::form is an embedded secure form solution used to handle sensitive user inputs on web pages, and exploitation could lead to session hijacking, credential theft, or unauthorized actions performed on behalf of users. The DOM-Based nature of the XSS means that the malicious payload is executed entirely on the client side, making detection and mitigation more challenging. This vulnerability requires user interaction, which somewhat limits automated exploitation but still poses a considerable risk especially in targeted phishing or social engineering campaigns.

For European organizations, the impact of CVE-2025-52733 can be substantial, particularly for those relying on ANON::form embedded secure forms for processing sensitive data such as personal information, payment details, or authentication credentials. Successful exploitation could lead to unauthorized access to user sessions, data leakage, and manipulation of form inputs, undermining trust and compliance with stringent data protection regulations like GDPR. The medium severity rating reflects the potential for attackers to compromise confidentiality, integrity, and availability, albeit with some limitations due to required user interaction. Organizations in sectors such as finance, healthcare, e-commerce, and government services are at higher risk due to the sensitive nature of their data and the criticality of their web applications. Additionally, the DOM-Based XSS can facilitate further attacks such as delivering malware, redirecting users to malicious sites, or escalating privileges within the application. The absence of known exploits in the wild provides a window for proactive mitigation, but the vulnerability’s presence in embedded forms used across multiple websites increases the attack surface. Failure to address this vulnerability could result in reputational damage, regulatory penalties, and financial losses.

1. Immediate mitigation should include implementing strict Content Security Policy (CSP) headers that restrict the execution of inline scripts and limit sources of executable code to trusted domains. 2. Sanitize and validate all user inputs rigorously on both client and server sides, employing context-aware encoding to neutralize potentially malicious characters before they reach the DOM. 3. Update or replace the ANON::form embedded secure form component with a patched or more secure alternative as soon as a vendor patch becomes available. 4. Employ runtime application self-protection (RASP) tools that can detect and block DOM-based XSS attempts in real-time within the browser environment. 5. Conduct regular security audits and penetration testing focused on client-side code and embedded form components to identify and remediate similar vulnerabilities. 6. Educate users and administrators about the risks of phishing and social engineering attacks that could trigger exploitation of this vulnerability. 7. Monitor web traffic and logs for unusual patterns indicative of attempted XSS attacks, such as suspicious URL parameters or script injections. 8. Where feasible, implement multi-factor authentication (MFA) to reduce the impact of session hijacking resulting from XSS exploitation.