CVE-2026-11567 in SureForms Plugin
Summary
by MITRE • 07/14/2026
The SureForms WordPress plugin before 2.11.1 does not properly validate the payment amount on forms that use a dynamically-sourced (variable/hidden) payment amount, allowing unauthenticated users to underpay for the configured product or subscription. Forms using a fixed configured price are not affected.
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Analysis
by VulDB Data Team • 07/14/2026
The SureForms WordPress plugin vulnerability represents a critical financial integrity issue that exploits improper input validation mechanisms within dynamic payment processing workflows. This security flaw affects versions prior to 2.11.1 and specifically targets forms utilizing dynamically-sourced payment amounts through variable or hidden fields rather than fixed configured prices. The vulnerability stems from inadequate sanitization and validation of payment data submitted by unauthenticated users, creating a pathway for unauthorized financial manipulation.
The technical implementation of this vulnerability occurs when the plugin processes payment requests containing dynamic pricing values that are not properly validated against expected ranges or configured values. Attackers can manipulate hidden form fields or variable parameters to submit reduced payment amounts while the system accepts these modified values without proper verification. This flaw operates at the application layer and represents a classic example of insufficient input validation, which maps directly to CWE-20 - Improper Input Validation. The vulnerability is particularly concerning because it allows for underpayment scenarios that could result in financial loss for plugin administrators while maintaining the appearance of legitimate transactions.
The operational impact of this vulnerability extends beyond simple monetary loss, as it undermines the trust and integrity of the payment processing system. Unauthenticated users can exploit this weakness to purchase products or subscribe to services at reduced rates, potentially leading to significant revenue loss for businesses relying on the plugin for e-commerce operations. The vulnerability affects the core payment validation logic within the plugin's form processing engine, compromising the financial transaction integrity that customers expect from legitimate online commerce platforms. This issue particularly impacts subscription-based services where repeated underpayment could result in substantial cumulative losses over time.
Security practitioners should implement immediate mitigations including updating to SureForms plugin version 2.11.1 or later, which contains proper input validation mechanisms for dynamic payment amounts. Additionally, administrators should review and monitor payment logs for unusual transaction patterns that might indicate exploitation attempts. The vulnerability demonstrates the importance of implementing robust input validation controls as outlined in the OWASP Top Ten Proactive Controls and aligns with ATT&CK technique T1078.004 - Valid Accounts, as it exploits legitimate form submission paths to manipulate financial outcomes. Organizations should also consider implementing additional payment verification mechanisms such as transaction amount thresholds, IP address monitoring, and anomaly detection systems to provide defense-in-depth against similar manipulation attacks targeting e-commerce platforms.