CVE-2025-53931 is a stored Cross-Site Scripting (XSS) vulnerability identified in the WeGIA web management application developed by LabRedesCefetRJ. WeGIA is an open-source platform primarily targeting Portuguese-speaking charitable institutions. The vulnerability exists in the `adicionar_raca.php` endpoint, specifically in the handling of the `raca` parameter. Prior to version 3.4.5, the application does not properly neutralize user-supplied input before embedding it into web pages, allowing attackers to inject malicious JavaScript code that is stored persistently on the server. When other users access the affected page, the malicious script executes in their browsers, potentially leading to session hijacking, credential theft, unauthorized actions on behalf of the user, or delivery of further malware. The vulnerability is remotely exploitable without authentication and requires only user interaction (visiting the compromised page). The CVSS 4.0 base score is 6.4 (medium severity), reflecting network attack vector, low attack complexity, no privileges or authentication required, but requiring user interaction and with limited confidentiality and integrity impact. The vulnerability was publicly disclosed on July 16, 2025, and fixed in WeGIA version 3.4.5. No known exploits are currently reported in the wild. The CWE classification is CWE-79, indicating improper neutralization of input during web page generation. This vulnerability highlights the risks of insufficient input sanitization in web applications, especially those used by organizations managing sensitive or community-related data.

For European organizations, especially charitable institutions or NGOs using WeGIA or similar localized web management tools, this vulnerability poses a significant risk to user trust and data integrity. Successful exploitation could lead to theft of user credentials, unauthorized access to organizational resources, and potential defacement or manipulation of web content. Given that WeGIA targets Portuguese language users, organizations in Portugal and other Lusophone communities in Europe may be particularly affected. The stored nature of the XSS increases risk as malicious scripts persist and affect multiple users over time. This could lead to reputational damage, data breaches involving personal or donor information, and disruption of organizational operations. Additionally, attackers could leverage the vulnerability to pivot to other internal systems if session tokens or credentials are compromised. Although no active exploits are known, the medium severity and ease of exploitation without authentication make timely patching critical to prevent future attacks.

European organizations using WeGIA should immediately upgrade to version 3.4.5 or later to remediate the vulnerability. Beyond patching, organizations should implement a multi-layered defense: 1) Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts. 2) Conduct thorough input validation and output encoding on all user-supplied data, especially in web forms and URL parameters. 3) Use security-focused code reviews and automated scanning tools to detect similar injection flaws. 4) Educate users about the risks of clicking on suspicious links and encourage reporting of unusual website behavior. 5) Monitor web application logs for unusual input patterns or repeated attempts to inject scripts. 6) Implement web application firewalls (WAFs) with rules to detect and block XSS payloads targeting the `raca` parameter or similar inputs. 7) Regularly backup web application data to enable recovery in case of defacement or data corruption. These targeted actions go beyond generic advice by focusing on the specific vulnerable endpoint and the operational context of WeGIA deployments.