CVE-2025-53526 is a Cross-Site Scripting (XSS) vulnerability classified under CWE-79, affecting the WeGIA web management system developed by LabRedesCefetRJ. WeGIA is designed to manage charitable institutions, and the vulnerability specifically exists in the novo_memorando.php component. The issue arises due to improper neutralization of user input during web page generation, allowing malicious scripts to be injected and executed in the context of the victim's browser. The attack vector involves submitting a crafted memo via novo_memorando.php, which is then reflected without proper sanitization on the listar_memorandos_antigos.php page. When this page is accessed, the injected script executes, potentially enabling attackers to perform actions such as session hijacking, defacement, or redirecting users to malicious sites. The vulnerability affects versions of WeGIA prior to 3.4.3, with the vendor having addressed the issue in version 3.4.3. The CVSS v4.0 base score is 2.0, indicating a low severity level. The vector details show that the attack can be performed remotely over the network without privileges or authentication, requires user interaction (the victim must visit the vulnerable page), and has limited scope and impact confined to the client side without compromising confidentiality, integrity, or availability of the server or other users. No known exploits are reported in the wild, suggesting limited active exploitation at this time.

For European organizations using WeGIA to manage charitable or non-profit institutions, this XSS vulnerability could lead to targeted attacks against users of the platform. Potential impacts include theft of session cookies, enabling attackers to impersonate legitimate users, unauthorized actions within the application, or delivery of malware through malicious scripts. While the server-side systems remain unaffected in terms of integrity and availability, the client-side compromise can erode user trust and lead to data leakage of sensitive user information. Given the niche application domain, the overall impact is likely limited to organizations directly using WeGIA. However, any compromise of user accounts or data could have reputational consequences and potentially violate data protection regulations such as GDPR if personal data is involved. The low CVSS score reflects the limited technical impact and the requirement for user interaction, but organizations should still prioritize patching to prevent exploitation, especially in environments with vulnerable users who may be less security-aware.

Organizations should upgrade WeGIA installations to version 3.4.3 or later, where the vulnerability has been fixed. If immediate upgrading is not feasible, implement input validation and output encoding on the novo_memorando.php and listar_memorandos_antigos.php pages to neutralize potentially malicious scripts. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. Additionally, educate users about the risks of clicking on untrusted links and encourage the use of modern browsers with built-in XSS protections. Regularly audit web application logs for suspicious activity related to memo submissions and accesses to the vulnerable pages. Finally, ensure that web application firewalls (WAFs) are configured to detect and block common XSS payloads targeting these endpoints.