Executive Summary

A vulnerability in phpMyFAQ before version 4.1.4 allows authenticated administrators to escalate privileges due to missing authorization in the editUser() and updateUserRights() endpoints. Non-SuperAdmin users with edit_user permission can exploit this to gain SuperAdmin access. The vulnerability has a CVSS score of 8.8.

Technical Analysis

The vulnerability class is a missing authorization vulnerability in the editUser() and updateUserRights() endpoints of phpMyFAQ. An attacker with authenticated administrator privileges and edit_user permission can exploit this vulnerability to escalate their privileges to SuperAdmin. The root cause is the lack of proper authorization checks in these endpoints, allowing an attacker to set the is_superadmin flag or grant arbitrary rights.

How It Gets Exploited

An attacker with authenticated administrator privileges and edit_user permission can exploit this vulnerability by sending a crafted request to the editUser() or updateUserRights() endpoints. For example, an attacker may send a request with a manipulated user ID or permissions to escalate their privileges to SuperAdmin. This can be done remotely over the network, and no user interaction is required. When the vulnerability is triggered, the attacker can gain SuperAdmin access, allowing them to perform arbitrary actions within the phpMyFAQ application.

Impact Assessment

The vulnerability affects phpMyFAQ versions before 4.1.4. An attacker can achieve privilege escalation to SuperAdmin, potentially leading to confidentiality, integrity, and availability impacts. The CVSS score for this vulnerability is 8.8, indicating a high severity level.

Recommended Actions

To mitigate this vulnerability, update phpMyFAQ to version 4.1.4 or later. Additionally, restrict access to the editUser() and updateUserRights() endpoints to only trusted administrators, and monitor for suspicious activity. Implement a Web Application Firewall (WAF) rule to detect and block suspicious requests to these endpoints.

Sources

  • National Vulnerability Database (NVD)
  • https://nvd.nist.gov/vuln/detail/CVE-2026-56396
  • https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-985r-q3qp-299h
  • https://www.vulncheck.com/advisories/phpmyfaq-privilege-escalation-via-missing-authorization-in-edituser-and-updateuserrights