CVE-2026-23727: WeGIA Open Redirect Vulnerability

CVE-2026-23727 Overview

CVE-2026-23727 is an Open Redirect vulnerability discovered in WeGIA, a web manager application designed for charitable institutions. The vulnerability exists in the /WeGIA/controle/control.php endpoint, where the nextPage parameter fails to undergo proper validation when used in combination with metodo=listarTodos and nomeClasse=TipoSaidaControle. This security flaw allows attackers to redirect users to arbitrary external websites by manipulating the unvalidated redirect parameter.

Critical Impact

Attackers can leverage the trusted WeGIA domain to redirect users to malicious external sites, enabling phishing attacks, credential theft, malware distribution, and social engineering campaigns.

Affected Products

• WeGIA versions prior to 3.6.2

Discovery Timeline

• January 16, 2026 - CVE-2026-23727 published to NVD
• January 16, 2026 - Last updated in NVD database

Technical Details for CVE-2026-23727

Vulnerability Analysis

This Open Redirect vulnerability (CWE-601) occurs due to insufficient validation of user-controlled input in the redirect mechanism of the WeGIA application. The vulnerability is network-accessible and requires low attack complexity, though it necessitates user interaction to be exploited successfully. When a victim clicks on a crafted URL containing a malicious nextPage parameter, they are redirected away from the legitimate WeGIA application to an attacker-controlled destination.

The attack leverages the trust users place in the WeGIA domain. Since the initial URL appears legitimate, users are more likely to interact with the link, making this vulnerability particularly effective for social engineering attacks against organizations using WeGIA for charitable institution management.

Root Cause

The root cause of this vulnerability is the lack of proper input validation and URL sanitization for the nextPage parameter in the /WeGIA/controle/control.php endpoint. The application accepts arbitrary URL values without verifying that the destination is within an allowed domain whitelist or is a relative path within the application itself. This violates the security principle of never trusting user input for redirect destinations.

Attack Vector

The attack vector exploits the combination of specific parameters in a crafted URL. An attacker constructs a URL targeting the vulnerable endpoint with the following components:

• The control.php endpoint path
• The metodo=listarTodos parameter
• The nomeClasse=TipoSaidaControle parameter
• A malicious nextPage parameter pointing to an external attacker-controlled domain

When an authenticated user clicks this crafted link, the WeGIA application processes the request and redirects the user to the attacker-specified URL. The attacker can then present a fake login page mimicking WeGIA to harvest credentials, distribute malware, or conduct other malicious activities while appearing to originate from a trusted source.

For technical implementation details regarding this vulnerability, refer to the GitHub Security Advisory GHSA-pmq9-8p4w-m4f3.

Detection Methods for CVE-2026-23727

Indicators of Compromise

• Suspicious HTTP requests to /WeGIA/controle/control.php containing external URLs in the nextPage parameter
• Redirect responses (HTTP 302/301) pointing to domains outside the organization's trusted list
• User reports of unexpected redirects when using WeGIA application links
• Phishing emails containing WeGIA URLs with suspicious nextPage parameter values

Detection Strategies

• Implement web application firewall (WAF) rules to inspect and alert on requests containing external URLs in redirect parameters
• Monitor HTTP access logs for requests to control.php with the specific parameter combination (metodo=listarTodos, nomeClasse=TipoSaidaControle, and suspicious nextPage values)
• Deploy URL inspection on email gateways to identify potential phishing attempts leveraging this vulnerability
• Use browser security extensions that warn users about suspicious redirects

Monitoring Recommendations

• Enable detailed logging for the WeGIA application, particularly for the control.php endpoint
• Configure SIEM alerts for redirect responses containing external domain destinations
• Monitor for anomalous user behavior patterns that may indicate successful phishing via this redirect vulnerability
• Track authentication attempts following redirects from the WeGIA domain to detect credential theft

How to Mitigate CVE-2026-23727

Immediate Actions Required

• Upgrade WeGIA to version 3.6.2 or later immediately, as this version contains the fix for this vulnerability
• Audit existing access logs for signs of exploitation attempts using the vulnerable parameter combination
• Notify users about potential phishing attacks that may leverage the trusted WeGIA domain
• Implement additional URL validation at the web server or WAF level as a defense-in-depth measure

Patch Information

The vulnerability has been addressed in WeGIA version 3.6.2. The fix was implemented through GitHub Pull Request #1333. Organizations should download and install the patched version from the official GitHub release page. Review the GitHub Security Advisory for complete details about the fix.

Workarounds

• If immediate patching is not possible, implement WAF rules to block or sanitize the nextPage parameter on the vulnerable endpoint
• Configure web server redirects to validate destination URLs against an allowlist before processing
• Disable or restrict access to the vulnerable control.php endpoint until the patch can be applied
• Educate users to verify the final destination URL before entering credentials after any redirect

# Example Apache mod_rewrite rule to block external redirects
# Add to .htaccess or Apache configuration
RewriteEngine On
RewriteCond %{QUERY_STRING} nextPage=https?:// [NC]
RewriteRule ^WeGIA/controle/control\.php$ - [F,L]