| Package | Affected versions | Patched versions |
|---|---|---|
| craftcms/commerce | ≥ 4.0.0, < 4.11.2≥ 5.0.0, < 5.6.5 | 4.11.25.6.5 |
The Order::setPaymentAmount() method accepts any float value without enforcing a minimum positive amount. The PaymentsController casts the user-supplied 'paymentAmount' parameter directly to float with no lower-bound check.
When the store has 'Allow Partial Payment on Checkout' enabled, a user can submit a payment amount of $0.00 or even a negative value, potentially marking orders as paid without a valid transaction.
<img width="690" height="80" alt="image" src="https://github.com/user-attachments/assets/78b653a6-ccae-4ce4-b71b-fc38a7757d73" /> <img width="761" height="200" alt="image" src="https://github.com/user-attachments/assets/665a235f-62c2-45fe-aa41-c3f266881c77" />Complete instructions, including specific configuration details, to reproduce the vulnerability. <img width="606" height="144" alt="image" src="https://github.com/user-attachments/assets/a04a6de2-7c5f-4837-aed6-58756e246b80" />
On stores with partial payment enabled, a customer may be able to set an arbitrarily small payment amount. Gateway behavior varies — some will process $0.00 transactions, effectively giving free order fulfillment.
Remediation
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