CVE-2026-83533
Received Received - Intake

Unauthenticated Order Completion in WP Express Checkout

Publication date: 2026-09-02

Last updated on: 2026-09-02

Assigner: WPScan

Description
The WP Express Checkout WordPress plugin before 2.4.9 does not verify server-side that a payment was actually completed before marking an order as paid, allowing unauthenticated users to forge a completed order without paying.

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Meta Information

Published
2026-09-02
Last Modified
2026-09-02
Generated
2026-09-02
AI Q&A
2026-09-02
EPSS Evaluated
N/A
NVD
CVE-2026-83533
EUVD
EUVD-2026-70046

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wp_express_checkout wp_express_checkout to 2.4.9 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-345 The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.

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Executive Summary

This vulnerability is in the WP Express Checkout WordPress plugin versions before 2.4.9. It allows unauthenticated users to forge a completed order without making a payment by exploiting a flaw in the wpec_process_payment function. The plugin fails to verify server-side if a payment was actually completed before marking an order as paid.

Detection Guidance

Check the installed version of the WP Express Checkout plugin. If it is version 2.4.9 or below, the system is vulnerable. Use commands like 'wp plugin list' in WordPress or inspect the plugin files for version details.

Impact Analysis

This vulnerability could allow attackers to create fake orders without paying, potentially leading to financial losses for store owners. It may also disrupt order management and cause incorrect inventory or revenue tracking.

Mitigation Strategies

Update the WP Express Checkout plugin to version 2.4.9 or higher immediately. If updating is not possible, consider disabling the plugin until an update is applied to prevent exploitation.

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