CVE-2025-55341 is a Cross Site Scripting (XSS) vulnerability identified in Quipux version 4.0.1, specifically within the anexos/anexos_nuevo.php script's asocImgRad functionality. XSS vulnerabilities arise when an application includes untrusted input in web pages without proper validation or encoding, enabling attackers to execute arbitrary scripts in victims' browsers. This vulnerability is remotely exploitable over the network (AV:N), requires no privileges (PR:N), and no user interaction (UI:N), making it relatively easy to exploit. The CVSS 3.1 base score of 6.5 reflects a medium severity, with impacts primarily on confidentiality and integrity but not availability. Successful exploitation could allow attackers to steal session cookies, perform actions on behalf of users, or manipulate displayed content, potentially leading to further attacks or data leakage. No patches or known exploits are currently available, indicating the vulnerability is newly disclosed. The CWE-79 classification confirms it is a classic reflected or stored XSS issue. The lack of authentication requirements and user interaction increases the risk, especially in environments where Quipux is exposed to untrusted networks. The vulnerability affects a specific PHP file handling attachments or image associations, suggesting the attack vector involves crafted input in file upload or attachment parameters.

For European organizations using Quipux, particularly in sectors relying on document and process management, this vulnerability could lead to unauthorized disclosure of sensitive information through session hijacking or credential theft. Integrity of user interactions and data displayed via the affected script could be compromised, enabling attackers to inject misleading or malicious content. While availability is not impacted, the breach of confidentiality and integrity could undermine trust in the system and lead to regulatory compliance issues under GDPR if personal data is exposed. The ease of remote exploitation without authentication increases the risk for public-facing deployments. Organizations with exposed Quipux instances may face targeted phishing or social engineering campaigns leveraging this vulnerability. The absence of known exploits provides a window for proactive mitigation, but also means attackers may develop exploits soon after disclosure. The impact is heightened in countries with significant Quipux adoption or critical infrastructure relying on it, potentially affecting government, legal, or administrative services.

Immediate mitigation should focus on implementing strict input validation and output encoding in the anexos/anexos_nuevo.php script, particularly for parameters handled by the asocImgRad functionality. Employ Content Security Policy (CSP) headers to restrict script execution sources and reduce XSS impact. Conduct thorough code reviews and security testing of the affected module to identify and remediate all injection points. Restrict access to the affected endpoint via network segmentation or web application firewalls (WAF) with rules to detect and block XSS payloads. Monitor logs for unusual requests targeting anexos_nuevo.php and anomalous user behavior. If possible, temporarily disable or restrict the vulnerable functionality until a vendor patch is released. Educate users about the risks of unsolicited links or content that could exploit XSS. Maintain up-to-date backups and incident response plans to quickly address any exploitation attempts. Engage with the Quipux vendor or community for official patches or updates and apply them promptly once available.