CVE-2025-55341 identifies a Cross Site Scripting (XSS) vulnerability in Quipux, an open-source document management system, specifically in version 4.0.1 through commit e1774ac. The vulnerability resides in the anexos/anexos_nuevo.php script, particularly in the asocImgRad functionality, which likely handles image association or attachment features. XSS vulnerabilities occur when untrusted input is improperly sanitized and then rendered in a web page, allowing attackers to inject malicious JavaScript code. When a victim accesses a crafted URL or page, the injected script executes in their browser context, potentially stealing cookies, session tokens, or performing actions on behalf of the user. Although no CVSS score has been assigned and no public exploits are known, the vulnerability's presence in a document management system used for handling sensitive organizational documents raises concerns. The lack of authentication requirements or user interaction details is not specified, but typical XSS attacks often require victim interaction such as clicking a malicious link or viewing a compromised page. The vulnerability was reserved in August 2025 and published in November 2025, indicating recent discovery. The absence of patch links suggests that a fix may not yet be publicly available, emphasizing the need for immediate mitigation steps. Given the nature of Quipux as a document management platform, exploitation could lead to confidentiality breaches or unauthorized actions within affected organizations.

For European organizations using Quipux or similar document management systems, this XSS vulnerability could lead to significant risks including session hijacking, theft of user credentials, and unauthorized access to sensitive documents. The impact on confidentiality is high as attackers could exfiltrate sensitive information. Integrity could also be compromised if attackers perform unauthorized actions on behalf of users. Availability impact is generally low for XSS but could be indirectly affected if attackers disrupt user sessions or inject malicious scripts that degrade service. The ease of exploitation is moderate to high since XSS attacks typically require only the victim to access a maliciously crafted page or link. The scope of affected systems depends on the deployment of Quipux within European organizations, particularly those in public administration, legal, or document-heavy sectors. Without authentication requirements specified, if the vulnerability is exploitable by unauthenticated users, the risk increases substantially. Overall, the threat poses a moderate risk to European entities relying on this software for document management and workflow.

1. Immediate review and hardening of input validation and output encoding in the anexos/anexos_nuevo.php script, especially in the asocImgRad functionality, to ensure all user-supplied data is properly sanitized against XSS payloads. 2. Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts within the application context. 3. Monitor web application logs for suspicious input patterns or attempts to inject scripts. 4. Educate users about the risks of clicking unknown links or opening untrusted attachments related to the document management system. 5. If a patch becomes available from Quipux maintainers, prioritize its deployment across all affected instances. 6. Consider deploying Web Application Firewalls (WAF) with rules tuned to detect and block XSS attack vectors targeting the affected endpoints. 7. Conduct security code reviews and penetration testing focused on input handling in the affected modules. 8. Isolate the document management system network segment to limit lateral movement in case of compromise.