CVE-2025-55170 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. The vulnerability exists in versions prior to 3.4.8 within the /html/alterar_senha.php endpoint. Specifically, the flaw arises from improper neutralization of user input in the 'verificacao' and 'redir_config' parameters, allowing an attacker to inject malicious JavaScript code that is reflected back to the user without adequate sanitization or encoding. This reflected XSS can be triggered when a user interacts with a crafted URL containing malicious payloads in these parameters. The vulnerability has a CVSS v3.1 base score of 6.5, indicating a medium severity level. The vector string (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N) shows that the attack can be executed remotely over the network without privileges, requires low attack complexity, no privileges, but does require user interaction (e.g., clicking a malicious link). The impact primarily affects confidentiality, as the attacker can steal sensitive information such as session cookies or tokens, potentially leading to account compromise or unauthorized access. Integrity and availability are not directly impacted. The issue was patched in version 3.4.8 of WeGIA, and no known exploits have been reported in the wild to date. Given the nature of the vulnerability, exploitation would typically involve social engineering to lure users into clicking malicious links that exploit the reflected XSS flaw.

For European organizations, especially those operating charitable or non-profit institutions that may use WeGIA or similar localized open-source software, this vulnerability poses a risk of session hijacking and unauthorized access to user accounts. The confidentiality breach could lead to exposure of sensitive user data, including personal information of donors, volunteers, or beneficiaries. While the vulnerability does not directly affect system integrity or availability, the resulting account compromise could facilitate further attacks or unauthorized actions within the application. Additionally, exploitation could damage organizational reputation and trust, particularly in sectors handling sensitive or personal data under GDPR regulations. The requirement for user interaction means phishing or social engineering campaigns could be used to exploit this vulnerability, increasing the risk if users are not adequately trained or if anti-phishing measures are weak. Since WeGIA focuses on Portuguese language and charitable institutions, European organizations with ties to Portuguese-speaking communities or those using this software are at higher risk.

1. Immediate upgrade to WeGIA version 3.4.8 or later, where the vulnerability has been patched, is the primary and most effective mitigation step. 2. Implement Web Application Firewall (WAF) rules to detect and block malicious payloads targeting the 'verificacao' and 'redir_config' parameters, focusing on typical XSS attack patterns. 3. Conduct user awareness training to reduce the likelihood of successful social engineering attacks that rely on user interaction to trigger the vulnerability. 4. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the browser, mitigating the impact of potential XSS payloads. 5. Regularly audit and sanitize all user inputs in custom or extended modules of WeGIA to prevent similar injection flaws. 6. Monitor logs for unusual URL requests or repeated attempts to access the vulnerable endpoint with suspicious parameters. 7. For organizations unable to immediately patch, consider temporarily disabling or restricting access to the /html/alterar_senha.php endpoint if feasible, or implement strict input validation at the web server or proxy level.