Executive Summary

CVE-2026-34427 is a high-severity privilege escalation vulnerability in Vvveb versions prior to 1.0.8.1. It exists in the admin user profile save endpoint, where authenticated users can improperly modify privileged fields on their own profiles.

Specifically, attackers can inject the parameter `role_id=1` into profile save requests, which escalates their privileges to Super Administrator. This elevated privilege grants access to plugin upload functionality, which can be exploited for remote code execution.

The vulnerability is classified under CWE-915 (Improperly Controlled Modification of Dynamically-Determined Object Attributes).

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Impact Analysis

This vulnerability allows an authenticated user to escalate their privileges to Super Administrator by injecting the `role_id=1` parameter during profile updates.

With Super Administrator privileges, an attacker can upload plugins, which can be used to execute arbitrary code remotely on the affected system.

This can lead to full system compromise, unauthorized access to sensitive data, and potential disruption of services.

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Detection Guidance

This vulnerability involves an authenticated user injecting the parameter `role_id=1` into the admin user profile save endpoint to escalate privileges. Detection can focus on monitoring HTTP requests to the user profile save endpoint for suspicious modifications of the `role_id` parameter.

• Inspect web server logs or proxy logs for POST requests to the admin user profile save endpoint containing `role_id=1`.
• Use command-line tools like grep or similar to search logs for `role_id=1` in requests, for example: `grep -i 'role_id=1' /var/log/nginx/access.log` or `grep -i 'role_id=1' /var/log/httpd/access_log`.
• Monitor for unexpected privilege escalations by auditing user roles in the application database or via the admin interface.

Since the vulnerability requires authentication, detection should also include reviewing authenticated user activity for unauthorized role changes.

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Mitigation Strategies

The immediate mitigation step is to upgrade Vvveb to version 1.0.8.1 or later, where this privilege escalation vulnerability has been fixed.

The fix involves strict validation of the `role_id` field in the user profile save functionality, ensuring only users with 'super_admin' privileges can assign or escalate roles.

• Apply the patch that restricts modification of the `role_id` parameter to authorized roles only, as implemented in the commit modifying `admin/controller/user/user.php`.
• Review and restrict user permissions to minimize the number of users with admin or super_admin roles.

Additionally, monitor and audit user role changes regularly to detect any unauthorized privilege escalations.

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Compliance Impact

The vulnerability allows authenticated users to escalate their privileges to Super Administrator by modifying privileged fields in their profile, enabling remote code execution through plugin uploads.

Such unauthorized privilege escalation and potential remote code execution can lead to unauthorized access, data breaches, and manipulation of sensitive information.

This can negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require strict access controls, data protection, and prevention of unauthorized access to sensitive data.

Organizations using affected versions of Vvveb prior to 1.0.8.1 may face increased risk of non-compliance due to this vulnerability if exploited.

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