CVE-2026-15045 in Wallet System for WooCommerce Plugin
Summary
by MITRE • 08/12/2026
The Wallet System for WooCommerce WordPress plugin before 2.7.10 does not validate a user-supplied wallet amount against the customer's actual stored balance during checkout, allowing authenticated customers to arbitrarily reduce their own order total, including down to zero, and complete checkout without paying the merchant.
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Analysis
by VulDB Data Team • 08/12/2026
The vulnerability in the Wallet System for WooCommerce WordPress plugin affects versions prior to 2.7.10 and represents a critical financial integrity flaw that undermines the core transactional security of e-commerce operations. This issue stems from insufficient input validation during the checkout process where the system fails to verify that user-supplied wallet amounts align with actual stored balances before processing payments. The flaw allows authenticated customers to manipulate their order totals by submitting arbitrary wallet deduction values, effectively enabling them to reduce their payment obligations to zero or any amount they choose, creating a direct financial loss mechanism for merchants.
The technical implementation of this vulnerability resides in the plugin's checkout validation logic which does not enforce proper balance constraints during transaction processing. When customers attempt to use their wallet funds for payment, the system accepts user-provided amounts without cross-referencing against the legitimate wallet balance stored in the database. This represents a classic case of insufficient data validation and inadequate access control measures that fall under CWE-20, which addresses improper input validation. The vulnerability demonstrates a failure in the principle of least privilege as authenticated users can manipulate their own financial transactions beyond normal operational boundaries.
Operationally, this vulnerability creates severe business impact by enabling customers to conduct unauthorized free transactions while maintaining the appearance of legitimate checkout processes. Attackers can exploit this flaw by simply manipulating the wallet amount field during checkout to zero or a minimal value, bypassing all payment processing requirements. The financial implications extend beyond individual transactions to include potential revenue loss, increased administrative overhead for investigating suspicious orders, and compromised trust in the platform's payment integrity. This vulnerability directly impacts the merchant's ability to accurately track revenue and maintain proper accounting records.
The mitigation strategy involves implementing robust server-side validation that verifies wallet amounts against actual stored balances before processing any transaction. System administrators should immediately upgrade to version 2.7.10 or later where this vulnerability has been patched, as the update includes proper balance validation mechanisms. Additionally, merchants should implement comprehensive logging and monitoring of wallet transactions to detect anomalous usage patterns that may indicate exploitation attempts. The solution aligns with ATT&CK tactic TA0001 (Initial Access) through credential compromise and TA0002 (Execution) through unauthorized transaction manipulation, making proper input validation essential for maintaining system integrity. Organizations should also consider implementing additional controls such as transaction approval workflows for high-value wallet deductions and regular security audits of e-commerce plugin configurations to prevent similar vulnerabilities from emerging in other components of their digital commerce infrastructure.