CVE-2026-57364 in Better Payment Plugin
Summary
by MITRE • 07/13/2026
Improper Validation of Specified Quantity in Input vulnerability in WPDeveloper Better Payment – Instant Payments, Donations, Fundraising with Subscriptions & More better-payment allows Accessing Functionality Not Properly Constrained by ACLs.This issue affects Better Payment – Instant Payments, Donations, Fundraising with Subscriptions & More: from n/a through <= 2.2.0.
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Analysis
by VulDB Data Team • 07/13/2026
This vulnerability represents a critical access control flaw in the WPDeveloper Better Payment plugin that allows unauthorized users to bypass proper authentication and authorization mechanisms. The issue stems from improper validation of specified quantities in input parameters, creating a pathway for privilege escalation attacks where malicious actors can access functionality not properly constrained by access control lists. The vulnerability affects versions ranging from the initial release through version 2.2.0, indicating a prolonged window of exposure for affected systems. This type of weakness falls under CWE-285 which specifically addresses improper authorization scenarios in software applications. The vulnerability enables attackers to manipulate input parameters that should be validated against user permissions and role-based access controls.
The technical implementation flaw occurs when the plugin fails to properly validate quantity parameters submitted by users during payment processing, donation requests, or subscription management operations. This validation failure allows authenticated users with lower privileges to submit crafted requests that bypass normal access control checks for administrative functions. The system does not adequately verify that the requesting user has proper authorization levels to perform specific actions such as modifying payment settings, accessing donor lists, or managing subscription tiers. Attackers can exploit this by manipulating quantity values in API calls or form submissions to gain access to restricted functionality normally reserved for administrators or premium users.
The operational impact of this vulnerability extends beyond simple privilege escalation to potentially compromise the entire payment processing infrastructure and sensitive financial data. When attackers can bypass ACLs, they may access donor databases containing personal information, financial records, and transaction histories that could be exploited for identity theft or financial fraud. The vulnerability also poses risks to business continuity as unauthorized modifications to payment systems could disrupt legitimate transactions or allow fraudulent activities to go undetected. Organizations using affected versions of the plugin face increased risk of data breaches and potential regulatory violations under privacy laws such as gdpr, ccpa, and other compliance frameworks that mandate proper access controls for sensitive information.
Mitigation strategies should focus on immediate patching of the vulnerable plugin to version 2.2.1 or later where the access control validation has been properly implemented. System administrators must also implement additional monitoring controls to detect unusual patterns in payment processing activities and access attempts to restricted functionality. Network segmentation and principle of least privilege should be enforced to limit exposure even if an attacker compromises a user account. The vulnerability demonstrates the critical importance of proper input validation and access control implementation as outlined in the mitre attack framework, specifically addressing techniques related to privilege escalation and unauthorized access. Organizations should conduct thorough security assessments of their wordpress installations to identify other potentially vulnerable plugins and ensure that all third-party components undergo proper security review before deployment in production environments.