CVE-2025-63872 identifies a Cross Site Scripting (XSS) vulnerability in DeepSeek version 3.2, a software product that generates SVG content based on user or model input. The vulnerability arises because the SVG content generated by the model is not properly sanitized, allowing an attacker to inject malicious JavaScript code. When a victim views the crafted SVG content, the injected script executes in their browser context, potentially leading to theft of sensitive information such as cookies or session tokens, or manipulation of the web page content. This vulnerability is classified under CWE-79, which covers improper neutralization of input during web page generation. The CVSS 3.1 base score of 6.1 reflects that the attack vector is network-based (remote), requires no privileges, but does require user interaction (the victim must view the malicious SVG). The scope is changed, indicating that the vulnerability can affect components beyond the initially vulnerable system, such as user sessions or connected services. Currently, there are no known exploits in the wild and no patches have been released, which suggests that organizations should prioritize monitoring and mitigation. The vulnerability affects confidentiality and integrity but does not impact availability. Since the affected versions are not explicitly listed, it is assumed that version 3.2 is vulnerable, and earlier or later versions may or may not be affected.

For European organizations, the impact of this XSS vulnerability can be significant, particularly for those using DeepSeek V3.2 in environments where SVG content is shared or displayed to multiple users. Successful exploitation could lead to unauthorized disclosure of sensitive data, session hijacking, or manipulation of displayed information, undermining trust and potentially causing regulatory compliance issues under GDPR. The vulnerability could be leveraged in targeted phishing campaigns or supply chain attacks, especially in sectors such as finance, healthcare, or government where data confidentiality is paramount. Although the vulnerability does not affect system availability, the compromise of user sessions or data integrity can disrupt business operations and damage reputation. The lack of patches increases the urgency for organizations to implement compensating controls. Because exploitation requires user interaction, user awareness and training are also critical to reduce risk.

To mitigate CVE-2025-63872, organizations should implement multiple layers of defense: 1) Apply strict input validation and sanitization on all model-generated SVG content to ensure no executable scripts can be injected. 2) Employ Content Security Policy (CSP) headers to restrict the execution of inline scripts and limit the sources of executable code in browsers. 3) Disable or restrict SVG rendering in contexts where it is not essential, or use safer rendering libraries that do not allow script execution. 4) Monitor web application logs and user activity for signs of suspicious SVG content or unusual script execution. 5) Educate users about the risks of interacting with untrusted SVG content and encourage cautious behavior. 6) Stay alert for official patches or updates from DeepSeek and apply them promptly once available. 7) Consider network-level controls such as web application firewalls (WAFs) configured to detect and block XSS payloads targeting SVG content. These measures collectively reduce the attack surface and limit the potential for exploitation.