CVE-2026-89411
Received Received - Intake

Unauthenticated Payment Manipulation in Paymattic WordPress Plugin

Publication date: 2026-09-28

Last updated on: 2026-09-28

Assigner: WPScan

Description
The Paymattic WordPress plugin from 4.6.20 before 4.6.26 does not verify that a confirmed Stripe payment belongs to the order it is applied to, allowing unauthenticated users to mark an arbitrary pending order as paid by confirming a smaller payment of their own against it.

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Meta Information

Published
2026-09-28
Last Modified
2026-09-28
Generated
2026-09-28
AI Q&A
2026-09-28
EPSS Evaluated
N/A
NVD
CVE-2026-89411
EUVD
EUVD-2026-88101

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
paymattic paymattic to 4.6.26 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability affects the Paymattic WordPress plugin versions before 4.6.26. It allows unauthenticated users to exploit an unbound Stripe PaymentIntent to mark any pending order as paid by confirming a smaller payment of their own. The plugin fails to verify that a confirmed Stripe payment matches the intended order.

Detection Guidance

To detect this vulnerability, check the Paymattic WordPress plugin version installed on your system. If the version is prior to 4.6.26, the system is vulnerable. You can verify the version by inspecting the plugin files or using WordPress admin panel.

Impact Analysis

Attackers could manipulate order payments, causing financial losses or incorrect order fulfillment. Businesses using the plugin might process orders without receiving proper payment, leading to disputes or compliance issues.

Compliance Impact

This vulnerability could potentially violate compliance with GDPR and HIPAA due to unauthorized access and manipulation of payment data. Unauthenticated users can mark orders as paid without proper verification, risking financial misreporting and data integrity issues. This may lead to non-compliance with data protection and financial regulations.

Mitigation Strategies

Immediately update the Paymattic WordPress plugin to version 4.6.26 or later. This version addresses the vulnerability by ensuring proper verification of Stripe payments against orders. Failure to update leaves the system exposed to unauthorized order manipulation.

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