CVE-2026-87846 in Shipping for Nova Poshta Plugin
Summary
by MITRE • 10/09/2026
The Shipping for Nova Poshta WordPress plugin through 1.19.8 does not perform any authorisation, nonce or ownership checks on one of its AJAX actions available to unauthenticated users, allowing anyone to delete the shipment records of arbitrary orders and to make the store issue the carrier's waybill-deletion request for those orders using the store's own stored API credentials.
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Analysis
by VulDB Data Team • 10/09/2026
The vulnerability identified in the Shipping for Nova Poshta WordPress plugin versions up to 1.19.8 represents a critical failure in access control mechanisms, specifically categorized under CWE-269 Improper Privilege Management and CWE-352 Cross-Site Request Forgery. The core technical flaw lies in the implementation of AJAX endpoints that handle shipment management operations without enforcing any form of authentication or request validation. In standard WordPress plugin architecture, sensitive administrative actions should require a valid user session with appropriate capabilities, such as administrator privileges, along with a nonces to prevent cross-site request forgery attacks. However, this specific plugin exposes an endpoint accessible to unauthenticated users, meaning that no login credentials are required to interact with the functionality responsible for managing shipment records and carrier communications.
This lack of authorization checks allows any external actor to execute destructive actions against the e-commerce store's data integrity. Specifically, attackers can delete shipment records associated with arbitrary orders within the system. This action disrupts the operational workflow by removing essential logistical information from the database, which may lead to confusion in order fulfillment processes and loss of historical shipping data necessary for auditing or customer support inquiries. Furthermore, the vulnerability extends beyond mere data deletion; it enables the attacker to trigger API requests directly through the store's backend infrastructure. By exploiting this flaw, an adversary can force the WordPress site to issue waybill-deletion requests to the Nova Poshta carrier service using the legitimate API credentials stored within the plugin configuration.
The operational impact of this vulnerability is severe due to its potential for both data loss and financial or reputational damage through unauthorized interactions with third-party logistics providers. The deletion of shipment records can cause significant administrative overhead as staff must manually reconstruct lost information, potentially leading to delayed shipments and customer dissatisfaction. More critically, the ability to trigger carrier-side deletions using stored API credentials means that an attacker could effectively cancel valid shipping labels or disrupt active deliveries without authorization. This not only compromises the integrity of the supply chain but also poses a risk if the API keys have broader permissions than intended for this specific function, potentially allowing further exploitation of the Nova Poshta account associated with those credentials.
From a threat modeling perspective aligned with MITRE ATT&CK frameworks, this vulnerability facilitates actions consistent with T1485 Data Destruction and T1078 Valid Accounts if the stored API keys are considered part of the authentication context that is being abused. The attack vector is remote and requires no user interaction beyond visiting a maliciously crafted URL or script, making it highly susceptible to automated scanning tools targeting known vulnerable plugins. This characteristic places it in high-risk categories for web application security assessments where unauthenticated access to administrative functions is detected.
Mitigation strategies must prioritize immediate remediation of the codebase by enforcing strict authorization checks on all AJAX handlers within the plugin. Developers should implement WordPress nonces to verify that requests originate from legitimate, authenticated admin interfaces and ensure that only users with specific capabilities can execute shipment-related operations. Additionally, it is advisable to review API key permissions to adhere to the principle of least privilege, ensuring that keys used for routine shipping tasks cannot perform destructive actions like bulk deletions without additional verification steps. Until an official patch is applied by the plugin vendor, site administrators should consider disabling the affected AJAX endpoints via server-side configuration or restricting access through firewall rules if possible, while also rotating any exposed API credentials to invalidate potential malicious sessions initiated during the period of vulnerability exposure.