CVE-2026-121435 in Froxlor
Summary
by MITRE • 11/03/2026
Froxlor before 2.3.15 contains an authorization bypass vulnerability that allows authenticated customers to create MySQL databases by calling the Mysqls.add API endpoint, which lacks the customer_hide_options check. Customers can invoke Mysqls.add even when the admin has disabled the MySQL feature, creating unauthorized databases within their own quota despite the policy.
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Analysis
by VulDB Data Team • 11/03/2026
The vulnerability identified in Froxlor versions prior to 2.3.15 represents a critical authorization bypass flaw that undermines the intended access control mechanisms of the web hosting administration panel. This issue specifically affects authenticated customers who possess valid login credentials but lack administrative privileges. The core technical failure lies within the Mysqls.add API endpoint, which is designed to allow users to provision new MySQL databases. However, this specific function fails to enforce the customer_hide_options check, a security control intended to respect administrator-configured restrictions on feature availability. Consequently, even when an system administrator has explicitly disabled the MySQL database creation feature for certain customers or groups through the administrative interface, these restricted users can still successfully invoke the API endpoint to create databases. This discrepancy between the user-facing interface and the underlying API logic creates a significant security gap that allows unauthorized resource allocation.
From a technical perspective, this vulnerability is classified as an Authorization Bypass using Incorrectly Assigned Privileges, aligning with CWE-285 in the Common Weakness Enumeration standard. The root cause stems from inconsistent implementation of access control checks across different parts of the application codebase. While higher-level UI components likely respect the hide options setting to prevent users from seeing or clicking relevant buttons, the backend API endpoint operates independently without verifying whether the feature is permitted for the current user context. This architectural inconsistency allows attackers who have obtained valid credentials through phishing, credential stuffing, or other means to bypass administrative policies simply by crafting direct HTTP requests to the vulnerable API endpoint rather than using the graphical interface. The attacker does not need elevated privileges; they only need a standard customer account that has been administratively restricted from MySQL access.
The operational impact of this vulnerability is substantial for hosting providers and their clients. By allowing unauthorized database creation, attackers can consume system resources such as disk space and memory within the allocated quota of the compromised user account. This leads to resource exhaustion which may degrade performance for other users on the same server if quotas are not strictly enforced or monitored in real-time. Furthermore, creating unauthorized databases provides a persistent foothold for further malicious activities. Attackers can use these databases to store phishing content, host command-and-control infrastructure, or exfiltrate data from other applications that share database credentials or suffer from SQL injection vulnerabilities. This effectively turns the hosting environment into an attack platform without triggering standard administrative alerts related to feature usage limits.
This behavior is consistent with techniques observed in the MITRE ATT&CK framework under T1078 Valid Accounts, where adversaries leverage legitimate user accounts to maintain persistence and evade detection by blending in with normal traffic patterns. The lack of proper authorization checks on API endpoints also reflects common weaknesses associated with insecure direct object references or broken access control mechanisms often seen in web applications that do not uniformly apply security policies across all entry points.
To mitigate this vulnerability, administrators must upgrade Froxlor to version 2.3.15 or later where the Mysqls.add endpoint has been patched to include the necessary customer_hide_options check. Until an upgrade is performed, system administrators should implement network-level controls such as firewall rules or web application firewalls that restrict access to the specific API endpoints associated with database creation for non-administrative users. Additionally, implementing strict rate limiting and monitoring logs for unusual patterns of database provisioning requests can help detect exploitation attempts in real-time. It is also recommended to review all other API endpoints within the Froxlor installation to ensure they similarly respect administrative restriction settings, as this pattern may exist elsewhere in the application codebase. Regular security audits focusing on authorization logic consistency between UI and backend services are essential for maintaining robust access control policies in web hosting environments.