CVE-2026-100145 in Synchrony Financing Plugin
Summary
by MITRE • 10/21/2026
The Synchrony Financing WordPress plugin before 1.1.2 does not properly authorise requests to one of its REST routes that modifies WooCommerce orders, allowing unauthenticated attackers to reassign any order to an account they control, tamper with its details, and read the associated customer's personal data.
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified in Synchrony Financing WordPress plugin versions prior to 1.1.2 represents a critical failure in access control mechanisms within the application's REST API implementation. This flaw specifically affects endpoints responsible for modifying WooCommerce orders, which are central to e-commerce operations involving financial transactions and customer data management. The core technical issue stems from an improper authorization check that fails to verify whether the user initiating the request possesses the necessary privileges or authentication credentials required to perform such sensitive actions. In a properly secured system, any attempt to modify order details or reassign ownership should require valid session tokens or API keys associated with an authenticated administrator or merchant account. However, due to this oversight, the server processes these requests without validating the requester's identity, effectively treating unauthenticated traffic as if it originated from a privileged user.
This lack of authentication enforcement allows malicious actors who are not logged into the WordPress dashboard to interact directly with the vulnerable REST endpoints. By crafting specific HTTP requests targeting the affected routes, an attacker can bypass all security barriers designed to protect order data and customer information. The operational impact is severe, as it enables unauthenticated attackers to reassign any existing WooCommerce order to a user account under their control. This capability fundamentally undermines the integrity of transaction records, allowing criminals to divert funds or goods intended for legitimate customers to themselves. Furthermore, because these endpoints also expose associated personal data, attackers can read sensitive customer information including names, addresses, and potentially payment details depending on how the plugin stores and transmits this data during order modification processes.
From a classification perspective, this vulnerability aligns with CWE-284 Improper Access Control, specifically reflecting issues related to insufficient authentication checks before performing state-changing operations. It also maps closely to MITRE ATT&CK technique T1078 Valid Accounts when considering the exploitation of system privileges through unauthorized means, although in this case it is more accurately described as a failure to enforce access controls for unauthenticated users which facilitates data exfiltration and manipulation. The ability to tamper with order details further implicates CWE-352 Cross-Site Request Forgery principles if the vulnerability can be triggered via malicious links or scripts, though direct API exploitation does not strictly require CSRF vectors given the lack of authentication checks entirely.
The security implications extend beyond immediate financial loss to include significant reputational damage and potential regulatory compliance violations such as GDPR or CCPA due to the exposure of personally identifiable information. Customers whose data is accessed without consent may face identity theft risks, while businesses suffer from eroded trust and potential legal liabilities associated with inadequate protection of consumer data. The ease of exploitation for this vulnerability means that automated scanning tools can rapidly identify vulnerable instances across the internet, leading to widespread compromise if left unpatched.
Mitigation strategies must prioritize immediate remediation by upgrading the Synchrony Financing plugin to version 1.1.2 or later where these authorization checks have been properly implemented and validated. Until an update is applied, administrators should consider disabling REST API access for non-essential endpoints using server-level configurations or security plugins that restrict unauthenticated requests to sensitive areas of the WordPress installation. Implementing Web Application Firewalls with rules targeting known vulnerable endpoint patterns can provide temporary protection against automated exploitation attempts. Additionally, enforcing strict input validation and ensuring that all state-changing operations require robust authentication mechanisms is essential for maintaining the integrity of e-commerce platforms. Regular security audits and penetration testing should be conducted to identify similar access control weaknesses in other plugins or custom code within the WordPress environment.