CVE-2026-103323 in Integration for Epos Now and WooCommerce Plugin
Summary
by MITRE • 10/07/2026
The Integration for Epos Now and WooCommerce WordPress plugin before 4.11.2 does not perform an authorization check on one of its REST endpoints, allowing unauthenticated users to retrieve the site's scheduled background tasks and their arguments, which include order identifiers and, when WooCommerce's deferred emails feature is enabled, the plaintext passwords of newly registered customers.
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified in versions of the Integration for Epos Now and WooCommerce WordPress plugin prior to version 4.11.2 represents a critical failure in access control mechanisms within the application's REST API implementation. This flaw specifically affects an endpoint designed to manage scheduled background tasks, which are essential components for maintaining data synchronization between the e-commerce platform and external systems. The core technical deficiency lies in the absence of proper authorization checks when processing requests directed at this specific endpoint. In a secure architecture, any operation that retrieves sensitive internal state or configuration data must verify that the requesting user possesses the necessary privileges to view such information. However, due to this oversight, the application fails to validate whether the requester is an authenticated administrator or has been granted explicit permission to access background task details. This lack of enforcement allows unauthenticated actors to interact with the endpoint as if they were legitimate system administrators, effectively bypassing standard security boundaries that are typically enforced by WordPress's authentication and authorization layers.
The operational impact of this vulnerability is severe due to the nature of the data exposed through the compromised endpoint. When an attacker successfully exploits this flaw, they gain access to a comprehensive list of scheduled background tasks along with their associated arguments. These arguments often contain unique order identifiers that can be used for further enumeration or targeted attacks against specific transactions within the WooCommerce store. More critically, if the site administrator has enabled WooCommerce's deferred emails feature, which is commonly configured to handle transactional communications such as account creation notifications asynchronously, the exposed data includes plaintext passwords of newly registered customers. This occurs because the arguments passed to these background tasks frequently contain user credentials required for sending welcome or activation emails. The exposure of plaintext passwords constitutes a direct compromise of confidentiality and integrity for customer accounts, leading to potential unauthorized access, identity theft, and further lateral movement within the compromised environment.
From a classification perspective, this vulnerability aligns with CWE-284, which describes Improper Access Control, specifically highlighting failures in authorization checks that allow unauthenticated users to perform restricted actions. It also relates closely to CWE-798, concerning the use of hardcoded or exposed credentials, as well as CWE-359 regarding exposure of private information through a public interface. In terms of offensive security frameworks such as MITRE ATT&CK, this vulnerability facilitates initial access and credential harvesting techniques often categorized under T1078 Valid Accounts or data exfiltration methods that leverage API endpoints to gather sensitive system state information. The ability to retrieve plaintext passwords significantly escalates the risk profile from a simple information disclosure issue to one involving direct account compromise, which can lead to widespread financial fraud if e-commerce credentials are reused across other platforms by affected customers.
Mitigation strategies must prioritize immediate remediation through software updates and defensive configuration changes. The primary solution is to upgrade the Integration for Epos Now and WooCommerce plugin to version 4.11.2 or later, where this authorization check has been properly implemented to restrict access to authenticated users with appropriate administrative privileges. In environments where an immediate update is not feasible due to compatibility constraints or deployment cycles, temporary mitigations should be considered. These may include restricting access to the WordPress REST API via web application firewall rules that block unauthenticated requests to known vulnerable endpoints if their specific URL patterns can be identified. Additionally, administrators should review their WooCommerce settings and consider disabling the deferred emails feature until the patch is applied, thereby preventing plaintext passwords from being included in background task arguments. Regular security audits of custom plugins and third-party integrations are also recommended to ensure that all REST endpoints adhere to strict authorization protocols consistent with industry best practices for secure API design.