CVE-2026-97071 in CURCY Plugin
Summary
by MITRE • 10/05/2026
Incorrect Calculation vulnerability in VillaTheme CURCY woo-multi-currency allows Integer Attacks.This issue affects CURCY: from n/a through 2.2.17.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 10/05/2026
The vulnerability identified as an incorrect calculation flaw within the VillaTheme CURCY plugin for WordPress represents a significant security risk, specifically categorized under integer attacks or arithmetic overflow issues. This defect exists in versions of the CURCY woo-multi-currency plugin ranging from its initial release through version 2.2.17. The core technical issue stems from improper handling of numerical data during currency conversion calculations, where the application fails to validate input ranges or enforce proper bounds checking before performing mathematical operations. In many web applications dealing with financial transactions and multi-currency support, precise integer arithmetic is critical for maintaining data integrity and preventing exploitation vectors that rely on unexpected behavior when numbers exceed expected limits or wrap around due to overflow conditions.
From a technical perspective, this flaw aligns closely with CWE-190, which describes Integer Overflow or Wraparound vulnerabilities. When an application performs calculations involving integers without adequate safeguards against values exceeding the maximum limit of the data type used, it can result in unexpected negative numbers or drastically reduced positive values. In the context of e-commerce platforms utilizing CURCY for dynamic currency conversion, such a miscalculation could lead to scenarios where product prices are displayed incorrectly, potentially at zero cost or even negative values if the system allows subsequent processing based on these flawed figures. This type of error is not merely cosmetic; it undermines the fundamental trust in the pricing engine and can be leveraged by malicious actors to manipulate transaction outcomes.
The operational impact of this vulnerability extends beyond simple display errors. Attackers with knowledge of the underlying calculation logic could craft specific requests that trigger integer overflow or underflow conditions during checkout processes or cart updates. By exploiting these arithmetic flaws, an attacker might attempt to purchase high-value items for negligible amounts or free of charge, effectively bypassing payment gateways and financial controls. This constitutes a form of business logic abuse where the integrity of monetary transactions is compromised due to software defects rather than network-level failures. The ability to manipulate prices directly impacts revenue protection and can lead to substantial financial losses if left unpatched in production environments handling significant transaction volumes.
This vulnerability also maps to specific techniques within the MITRE ATT&CK framework, particularly those related to exploitation for economic gain or privilege escalation through application logic flaws. While not a direct code execution vector like buffer overflows, it falls under categories of abuse involving input validation failures and arithmetic errors that allow unauthorized modification of system state—in this case, financial records and order totals. The lack of robust input sanitization means that external inputs influencing currency conversion rates or quantity multipliers are processed without sufficient verification against expected numerical boundaries, allowing edge cases to propagate through the application logic unchecked.
Mitigation strategies must prioritize immediate patching for all affected installations running versions up to 2.2.17. The vendor should release an updated version of CURCY that implements strict input validation and uses safe arithmetic libraries or explicit checks before performing calculations involving user-supplied data. Administrators unable to upgrade immediately should consider implementing web application firewall rules that monitor for anomalous transaction patterns indicative of price manipulation attempts, such as sudden spikes in low-value orders or requests containing unusually large numerical parameters. Additionally, enforcing server-side validation on all financial computations ensures that client-side manipulations cannot override the authoritative pricing logic maintained by the backend systems. Regular security audits focusing on e-commerce plugins are essential to identify similar arithmetic flaws before they can be exploited for malicious purposes.