CVE-2026-103329: CWE-347 Improper Verification of Cryptographic Signature in Super Payments
Description
The Super Payments WordPress plugin before 1.43.1 does not properly verify the authenticity of incoming payment webhook notifications, as the signing key used to validate their signature is empty by default, allowing unauthenticated attackers to forge a valid signature and mark arbitrary WooCommerce orders as paid without payment.
CVSS v3.1
Score 5.3medium
Affected software
Super Payments
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Super Payments WordPress plugin versions before 1.43.1 do not correctly verify cryptographic signatures on payment webhook notifications. The signing key used to validate these signatures is empty by default, leading to improper verification (CWE-347). As a result, attackers can forge signatures to manipulate WooCommerce order statuses, marking orders as paid without legitimate transactions.
Potential Impact
An attacker can exploit this vulnerability to forge payment webhook notifications, causing WooCommerce orders to be marked as paid without actual payment. This leads to potential financial loss and order fulfillment fraud. The vulnerability does not impact confidentiality or availability but impacts the integrity of order payment status.
Mitigation Recommendations
Upgrade the Super Payments plugin to version 1.43.1 or later, where this vulnerability is fixed. Since the signing key is empty by default in affected versions, configuring a proper signing key and ensuring signature verification is correctly implemented will mitigate the risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-30T12:37:57.952Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac8cda92cdf04f6564f74b3
Added to database: 10/09/2026, 11:19:05 UTC
Last enriched: 10/09/2026, 11:33:33 UTC
Last updated: 10/09/2026, 18:57:32 UTC
Views: 17
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