CVE-2026-111831 in FluentForm Plugin
Summary
by MITRE • 10/19/2026
Missing Authorization vulnerability in WP ManageNinja LLC FluentForm fluentform allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects FluentForm: from n/a through 6.2.15.
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Analysis
by VulDB Data Team • 10/19/2026
The identified security flaw represents a critical failure in access control mechanisms within the FluentForm plugin, specifically affecting versions ranging from its initial release up to version 6.2.15 developed by WP ManageNinja LLC. This vulnerability stems from an absence of proper authorization checks on specific endpoints or administrative functions exposed by the application. In web applications, particularly those built on content management systems like WordPress, it is imperative that every action requiring elevated privileges verifies that the initiating user possesses the necessary permissions before execution. The flaw in FluentForm indicates that these verification steps were either missing or incorrectly implemented, allowing any authenticated user, and potentially unauthenticated users depending on the specific vector, to bypass intended security boundaries. This type of defect falls squarely under Common Weakness Enumeration category CWE-284, which describes Improper Access Control, where an actor is able to access resources or perform actions that they are not authorized to do.
From a technical perspective, this misconfiguration allows attackers to manipulate the application's state by sending crafted requests to endpoints designed for administrative tasks such as creating forms, modifying settings, or managing user data without providing valid credentials or session tokens associated with an administrator role. The operational impact of such a vulnerability is severe because it undermines the fundamental principle of least privilege within the WordPress ecosystem. An attacker who exploits this flaw can gain unauthorized access to sensitive form submissions containing personally identifiable information, modify existing forms to inject malicious code into public-facing pages, or escalate their privileges to full administrative control over the website. This level of compromise enables further attacks including data exfiltration, defacement, and the installation of persistent backdoors that facilitate long-term unauthorized access.
The exploitation of this vulnerability aligns with several tactics within the MITRE ATT&CK framework for enterprise security. Specifically, it relates to T1078 Valid Accounts, where attackers leverage legitimate credentials or bypass authentication requirements to maintain presence in the system. Furthermore, if the attacker uses these elevated privileges to modify website content or settings, it maps directly to T1531 Account Access Removal or T1496 Endpoint Denial of Service depending on the intent. The lack of authorization checks also facilitates lateral movement within a compromised network environment if the WordPress instance is part of a larger infrastructure, as the attacker can use the platform as a pivot point for further intrusions against other internal systems.
To mitigate this risk, immediate action must be taken to update the FluentForm plugin to version 6.2.16 or any subsequent release that includes patches addressing these access control deficiencies. Organizations relying on older versions should consider temporary workarounds such as restricting administrative URL paths through web application firewalls if updating is not immediately feasible. Additionally, implementing strict role-based access controls and regularly auditing user permissions can help minimize the attack surface. Security teams should also monitor logs for unusual activity patterns indicative of unauthorized form modifications or privilege escalation attempts, ensuring that any potential exploitation is detected early in the kill chain before significant damage occurs to data integrity or system availability.