CVE-2026-89411: CWE-345 Insufficient Verification of Data Authenticity in Paymattic
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.
AI Analysis
Technical Summary
CVE-2026-89411 is an insufficient verification of data authenticity vulnerability (CWE-345) in the Paymattic WordPress plugin. Specifically, versions from 4.6.20 up to but not including 4.6.26 fail to verify that a confirmed Stripe payment corresponds to the intended order. This flaw allows unauthenticated attackers to mark arbitrary pending orders as paid by confirming a smaller payment against them, potentially leading to unauthorized order fulfillment or accounting inconsistencies.
Potential Impact
The vulnerability allows unauthenticated attackers to manipulate order payment status by associating their own smaller Stripe payments with arbitrary pending orders. This can result in unauthorized marking of orders as paid, impacting the integrity of order processing and potentially causing financial or operational discrepancies. There is no direct confidentiality or availability impact reported.
Mitigation Recommendations
A fix is available in Paymattic version 4.6.26 and later. Users should upgrade to version 4.6.26 or newer to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
CVE-2026-89411: CWE-345 Insufficient Verification of Data Authenticity in Paymattic
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.
CVSS v3.1
Score 5.3medium
Affected software
Paymattic
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-89411 is an insufficient verification of data authenticity vulnerability (CWE-345) in the Paymattic WordPress plugin. Specifically, versions from 4.6.20 up to but not including 4.6.26 fail to verify that a confirmed Stripe payment corresponds to the intended order. This flaw allows unauthenticated attackers to mark arbitrary pending orders as paid by confirming a smaller payment against them, potentially leading to unauthorized order fulfillment or accounting inconsistencies.
Potential Impact
The vulnerability allows unauthenticated attackers to manipulate order payment status by associating their own smaller Stripe payments with arbitrary pending orders. This can result in unauthorized marking of orders as paid, impacting the integrity of order processing and potentially causing financial or operational discrepancies. There is no direct confidentiality or availability impact reported.
Mitigation Recommendations
A fix is available in Paymattic version 4.6.26 and later. Users should upgrade to version 4.6.26 or newer to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-11T16:27:21.951Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aba0dbef7a7c541064c3352
Added to database: 09/28/2026, 06:48:30 UTC
Last enriched: 09/28/2026, 07:02:59 UTC
Last updated: 09/29/2026, 02:53:42 UTC
Views: 17
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