CVE-2026-8615 in Reviso Exporter Plugin
Summary
by MITRE • 09/09/2026
The Reviso Exporter for WooCommerce plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check and missing nonce verification on the disconnect_callback() function in versions up to, and including, 1.2.3. The function is registered to the 'wp_ajax_wcefr-disconnect' AJAX action and unconditionally calls delete_option('wcefr-agt'), which removes the Reviso Agreement Grant Token used to authenticate API calls. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete the plugin's stored Agreement Grant Token, breaking the connection between WooCommerce and the Reviso service.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified in the Reviso Exporter for WooCommerce plugin affects versions up to 1.2.3 and represents a critical failure in server-side request validation logic within the WordPress ecosystem. The core issue resides specifically in the disconnect_callback function, which is exposed via the wp_ajax_wcefr-disconnect AJAX action hook. In standard WordPress development practices, any endpoint handling sensitive administrative actions must enforce strict access controls to ensure that only authorized users with appropriate privileges can execute state-changing operations. However, this implementation fails to perform a capability check, meaning it does not verify whether the requesting user possesses the necessary permissions, such as administrator or editor status, before proceeding with execution. Furthermore, the function lacks nonce verification, which is essential for preventing Cross-Site Request Forgery attacks by ensuring that requests originate from legitimate sources and are not forged by malicious third-party sites.
From a technical perspective, the absence of these security controls allows authenticated attackers to manipulate plugin state through simple HTTP POST requests. The disconnect_callback function unconditionally invokes delete_option with the key wcefr-agt, which effectively removes the Agreement Grant Token stored in the WordPress database options table. This token is fundamental for maintaining authentication between the WooCommerce store and the Reviso service API. By deleting this credential without proper authorization checks or anti-CSRF protections, an attacker can sever the integration link regardless of their actual role within the application, provided they have at least Subscriber-level access. This design flaw violates the principle of least privilege and fails to implement robust input validation mechanisms required for secure plugin architecture.
The operational impact of this vulnerability is significant as it disrupts business continuity by breaking the synchronization between WooCommerce orders and Reviso accounting services. When the Agreement Grant Token is deleted, subsequent API calls made by the plugin will fail authentication checks on the Reviso side, leading to a complete halt in data export operations. This results in lost sales records, inaccurate financial reporting, and potential compliance issues for businesses relying on automated bookkeeping processes. While the vulnerability does not directly lead to remote code execution or direct database exfiltration of customer PII, it constitutes a denial-of-service condition against critical business functionality and can be exploited by low-privileged users who might otherwise have limited access rights.
This flaw aligns with CWE-284 Improper Access Control, as the application fails to restrict actions based on user roles, and CWE-352 Cross-Site Request Forgery due to the lack of anti-CSRF token validation. In terms of MITRE ATT&CK mapping, this vulnerability facilitates lateral movement or privilege escalation within the context of web applications by allowing lower-tier users to perform administrative functions typically reserved for higher-level accounts. It also relates to TA0005 Defense Evasion as it allows an attacker to disrupt security mechanisms and operational integrity without triggering immediate alarms associated with high-privilege account usage.
To mitigate this risk, site administrators should immediately update the Reviso Exporter plugin to version 1.2.4 or later where these checks have been implemented. For environments unable to patch immediately due to compatibility constraints, temporary mitigations include restricting access to wp-admin and AJAX endpoints through web application firewall rules that require valid nonces for specific action hooks. Additionally, implementing strict role-based access control plugins can help enforce permission boundaries more rigorously until the official fix is applied. Regular auditing of plugin code against WordPress coding standards regarding nonce verification and capability checks is recommended to prevent similar vulnerabilities in other installed extensions.