Executive Summary

CVE-2026-45026 is a Stored Cross-Site Scripting (XSS) vulnerability in the WeGIA web manager application, specifically in the Processo de Aceitação page (html/atendido/processo_aceitacao.php).

This vulnerability allows an authenticated user to inject malicious JavaScript code into the page by exploiting improper sanitization of user input, particularly in the process description field.

When other users access this page, the injected JavaScript executes in their browsers, enabling attackers to hijack sessions and potentially take over user accounts.

The issue arises because the application fails to properly encode or sanitize user-controlled input, allowing arbitrary script execution.

This vulnerability is fixed in version 3.7.3 of WeGIA.

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Compliance Impact

The Stored Cross-Site Scripting (XSS) vulnerability in WeGIA allows attackers to hijack user sessions and take over accounts by injecting malicious JavaScript. This can lead to unauthorized access to sensitive user data and actions performed without user consent.

Such unauthorized access and potential data breaches can negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive information, as well as ensuring user consent and data integrity.

Failure to address this vulnerability could result in violations of these regulations due to compromised confidentiality and integrity of user data.

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Impact Analysis

This vulnerability can have serious impacts including session hijacking and account takeover.

• Attackers can execute arbitrary JavaScript in the context of authenticated users.
• Attackers can steal session cookies, allowing them to impersonate legitimate users.
• Attackers can perform unauthorized actions on behalf of users.
• Compromise of user accounts can lead to further unauthorized access and data breaches.

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Detection Guidance

This vulnerability can be detected by checking for the presence of malicious JavaScript payloads injected into the Processo de Aceitação page (html/atendido/processo_aceitacao.php). Specifically, look for suspicious input in the process description field, such as payloads like <img src=1 onerror=alert("XSS")>.

To detect exploitation attempts, you can monitor HTTP requests and responses for unusual script tags or event handlers in the process description field.

Commands to help detect this include:

• Using grep or similar tools on server logs to find suspicious payloads: grep -i '<img src=1 onerror=' /path/to/weblog.log
• Using curl or wget to fetch the Processo de Aceitação page and inspect the HTML for injected scripts: curl -s http://yourserver/html/atendido/processo_aceitacao.php | grep -i '<img src=1 onerror='
• Using browser developer tools or automated scanners to check for stored XSS payloads executing on the page.

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Mitigation Strategies

The immediate step to mitigate this vulnerability is to upgrade the WeGIA application to version 3.7.3 or later, where the issue has been fixed.

Until the upgrade can be performed, restrict authenticated user input in the process description field to prevent injection of malicious scripts.

Additionally, apply input sanitization and output encoding on user-controlled fields to prevent execution of injected JavaScript.

Monitor user activity for suspicious behavior and consider temporarily limiting access to the Processo de Aceitação page if possible.

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