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GHSA-78vr-q6cf-c7p6medium6.9No CVE assigned

Craft Commerce: Partial Payment Amount Without Lower Bound Validation

Impact

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.

Source excerpt · OSV

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

craftcms/commerce Packagist
Affected rangeRecorded fix
From 5.0.0 before 5.6.5Ecosystem versions5.6.5
From 4.0.0 before 4.11.2Ecosystem versions4.11.2

Version evidence: OSV · GHSA-78vr-q6cf-c7p6

View original version evidence (168 explicit versions)

Original source description

Summary

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.

Details

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" />

PoC

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" />

Impact

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

<img width="718" height="98" alt="image" src="https://github.com/user-attachments/assets/aa64b696-9749-45e4-97f6-8d7299cdf1d6" />

References