CVE-2025-6725 is a Cross-Site Scripting (XSS) vulnerability identified in the PdfViewer component of Progress Software's Kendo UI for jQuery, specifically affecting version 2024.4.1112. This vulnerability arises due to improper neutralization of input during web page generation (CWE-79). The issue manifests when a specially crafted document is loaded into the PdfViewer, and the user interacts with a tool that triggers a re-rendering of the Document Object Model (DOM). During this re-rendering process, malicious script code embedded in the document can be executed in the context of the user's browser. The vulnerability has a CVSS v3.1 base score of 5.4, indicating a medium severity level. The vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) shows that the attack can be launched remotely over the network with low attack complexity, requires the attacker to have some privileges (PR:L), and requires user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact on confidentiality and integrity is low, with no impact on availability. No known exploits in the wild have been reported so far, and no patches have been linked yet. This vulnerability is significant because Kendo UI for jQuery is widely used in web applications for rich UI components, including PDF viewing, which is common in enterprise environments. Exploitation could allow attackers to execute arbitrary scripts in the context of the affected web application, potentially leading to session hijacking, data theft, or unauthorized actions within the application.

For European organizations, this vulnerability poses a moderate risk, particularly for those using web applications built with Kendo UI for jQuery's PdfViewer component. The XSS flaw could be exploited to steal sensitive user information such as authentication tokens or personal data, or to perform actions on behalf of the user, undermining data confidentiality and integrity. Sectors such as finance, healthcare, government, and critical infrastructure that rely on web-based document viewing and manipulation tools are especially at risk. Given the scope change in the vulnerability, the impact could extend beyond the immediate component, potentially affecting other parts of the web application or integrated systems. The requirement for user interaction means social engineering or phishing tactics might be used to trigger the exploit. Although no active exploits are reported, the presence of this vulnerability in a widely used UI framework means that attackers could develop exploits once the vulnerability becomes more widely known, increasing the risk over time.

European organizations should take proactive steps to mitigate this vulnerability. First, they should monitor Progress Software's advisories closely for an official patch or update addressing CVE-2025-6725 and apply it promptly once available. In the interim, developers should review and sanitize any user-controllable inputs or documents loaded into the PdfViewer component to prevent malicious scripts from being embedded. Implement Content Security Policy (CSP) headers with strict script-src directives to limit the execution of unauthorized scripts. Employ input validation and output encoding on all data rendered in the PdfViewer and related UI components. Additionally, organizations should educate users about the risks of interacting with untrusted documents and implement monitoring to detect unusual activities that may indicate exploitation attempts. Web application firewalls (WAFs) can be tuned to detect and block typical XSS payloads targeting this component. Finally, consider isolating the PdfViewer component in a sandboxed iframe to reduce the impact of potential script execution.