GHSA-78vr-q6cf-c7p6
Craft Commerce: Partial Payment Amount Without Lower Bound Validation
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" />
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
What each source reports
GitHub Advisories Score used
Craft Commerce: Partial Payment Amount Without Lower Bound Validation
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" />
- Record
GHSA-78vr-q6cf-c7p6- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-20, CWE-1284
- Updated
- 2026-11-02
OSV
Craft Commerce: Partial Payment Amount Without Lower Bound Validation
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" />
- Record
GHSA-78vr-q6cf-c7p6- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-1284, CWE-20
- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
craftcms/commercePackagist | 5.0.0 to 5.6.4 | 5.6.5 |
craftcms/commercePackagist | 4.0.0 to 4.11.1 | 4.11.2 |
craftcms/commercePackagist | 5.0.0 up to 5.6.5, plus listed versions 5.0.15.0.105.0.10.15.0.115.0.11.1 Show 45 moreShow less5.0.125.0.12.15.0.12.25.0.135.0.145.0.155.0.165.0.16.15.0.16.25.0.175.0.185.0.195.0.25.0.35.0.45.0.55.0.65.0.75.0.85.0.95.1.05.1.0-beta.15.1.0-beta.25.1.0-beta.35.1.0.15.1.15.1.25.1.35.1.45.2.05.2.15.2.105.2.115.2.125.2.12.15.2.25.2.2.15.2.35.2.45.2.55.2.65.2.75.2.85.2.95.2.9.1 | 5.6.5 |
craftcms/commercePackagist | 4.0.0 up to 4.11.2, plus listed versions 4.0.14.0.24.0.34.0.44.1.0 Show 45 moreShow less4.1.14.1.24.1.34.10.04.10.14.10.24.11.04.11.0.14.11.14.2.04.2.14.2.104.2.114.2.24.2.34.2.44.2.54.2.5.14.2.64.2.74.2.84.2.94.3.04.3.14.3.24.3.34.4.04.4.14.4.1.14.5.04.5.14.5.1.14.5.24.5.34.5.44.6.04.6.14.6.104.6.114.6.124.6.134.6.144.6.24.6.3.14.6.4 | 4.11.2 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
GHSA-78vr-q6cf-c7p6 is a medium vulnerability (CVSS 6.9) in craftcms/commerce, published June 19, 2026. No source lists public exploit code. Fixed in craftcms/commerce 5.6.5.
References
Left out here: 66 versions. The JSON record has them.