CVE-2026-5069 in Fluent Forms Plugin
Summary
by MITRE • 07/10/2026
The Fluent Forms plugin for WordPress is vulnerable to incorrect authorization via the 'subscription_id' parameter in versions up to, and including, 6.2.1. This is due to insufficient ownership authorization checks in the payment cancellation AJAX flow. This makes it possible for authenticated attackers, with subscriber-level access and above, to submit cancellation requests for other users' subscriptions.
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Analysis
by VulDB Data Team • 07/10/2026
The vulnerability in the Fluent Forms plugin affects versions up to and including 6.2.1 and represents a critical authorization flaw that undermines the security of payment subscription management. This issue stems from inadequate validation mechanisms within the payment cancellation AJAX workflow where the system fails to properly verify ownership of subscriptions before processing cancellation requests. The flaw specifically targets the 'subscription_id' parameter which serves as the primary identifier for subscription records, allowing attackers to manipulate this value and submit cancellation commands for subscriptions they do not own.
The technical implementation of this vulnerability creates a path for privilege escalation through unauthorized access to payment processing functions. When authenticated users with subscriber-level permissions or higher attempt to cancel subscriptions, the plugin's code does not perform proper authorization checks to confirm that the requesting user has legitimate ownership rights over the target subscription. This oversight enables attackers to craft malicious requests using valid subscription identifiers from other users' accounts, effectively bypassing the intended access controls.
From an operational perspective, this vulnerability poses significant risks to both individual users and service providers who rely on Fluent Forms for subscription management. Attackers can potentially cancel legitimate subscriptions of other users, leading to revenue loss for service providers while simultaneously disrupting service availability for affected customers. The impact extends beyond simple cancellation as it represents a fundamental breakdown in the principle of least privilege and could enable further exploitation if additional vulnerabilities exist within the payment processing framework.
The vulnerability aligns with CWE-285 which addresses improper authorization issues in software systems, specifically targeting scenarios where access controls fail to properly validate user permissions before granting access to protected resources. This weakness falls under the broader category of authorization bypass vulnerabilities that are frequently exploited in web application attacks and can be mapped to ATT&CK technique T1078 which covers valid accounts and credential abuse. The susceptibility to this type of attack highlights the importance of implementing robust access control mechanisms throughout all application components, particularly those handling financial transactions.
Organizations should immediately update to versions beyond 6.2.1 where this vulnerability has been addressed through proper authorization checks in the payment cancellation flow. System administrators should also conduct thorough audits of user permissions and subscription management functions to identify any potential exploitation attempts. Additional mitigations include implementing network-level restrictions on AJAX endpoints, monitoring for unusual subscription cancellation patterns, and ensuring that all payment processing components enforce strict ownership verification before executing sensitive operations. The vulnerability demonstrates the critical importance of proper authorization checks in payment systems and serves as a reminder that even seemingly minor access control oversights can have significant financial implications for both service providers and their customers.