CVE-2025-53936 is a Reflected 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, providing web management functionalities. The vulnerability exists in the `personalizacao_selecao.php` endpoint, specifically in the handling of the `nome_car` parameter. Prior to version 3.4.5, this parameter is improperly sanitized, allowing attackers to inject malicious JavaScript code that is reflected back in the HTTP response. This improper neutralization of input during web page generation corresponds to CWE-79, a common web application security weakness. The CVSS 4.0 base score is 6.4 (medium severity), reflecting that the vulnerability is remotely exploitable over the network without authentication, requires user interaction (victim must click a crafted link), and impacts confidentiality and integrity to a low extent, with a high scope and impact on security properties. Although no known exploits are currently reported in the wild, the vulnerability presents a risk of session hijacking, credential theft, or redirection to malicious sites if exploited. The issue is fixed in WeGIA version 3.4.5 by properly sanitizing or encoding the `nome_car` parameter to prevent script injection. Given the nature of reflected XSS, exploitation requires social engineering to lure users into clicking malicious links or visiting crafted URLs. The vulnerability affects all WeGIA deployments running versions prior to 3.4.5.

For European organizations using WeGIA, particularly charitable institutions or NGOs serving Portuguese-speaking communities, this vulnerability poses a moderate risk. Successful exploitation could lead to theft of session cookies, enabling attackers to impersonate legitimate users and potentially access sensitive data or perform unauthorized actions within the application. It could also facilitate phishing attacks by redirecting users to malicious websites or displaying fraudulent content. While the vulnerability does not directly compromise backend systems or data integrity at a high level, the breach of user sessions and trust can lead to reputational damage and potential data exposure. Since WeGIA is specialized software with a niche user base, the overall impact is limited to organizations using this product. However, given the focus on charitable institutions, any compromise could disrupt critical services or donor communications. The requirement for user interaction reduces the likelihood of widespread automated exploitation but does not eliminate targeted attacks against high-value users or administrators.

European organizations using WeGIA should immediately upgrade to version 3.4.5 or later, where the vulnerability is patched. If immediate upgrade is not feasible, implement web application firewall (WAF) rules to detect and block suspicious input patterns targeting the `nome_car` parameter, such as script tags or common XSS payloads. Conduct user awareness training emphasizing caution when clicking on unsolicited links, especially those appearing to come from within the organization. Employ Content Security Policy (CSP) headers to restrict the execution of inline scripts and reduce the impact of any injected scripts. Regularly audit and monitor web server logs for unusual requests to the vulnerable endpoint. Additionally, review and harden session management practices to limit the damage from stolen session tokens, such as using HttpOnly and Secure flags on cookies and implementing short session timeouts. Finally, consider deploying runtime application self-protection (RASP) tools that can detect and block XSS attempts in real time.