Shopper: Negative discount values accepted and propagated through order calculation pipeline

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-56831
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-15 18:17:25 UTC
Updated2026-09-16 15:17:38 UTC
DescriptionShopper is a Headless e-commerce Admin Panel. Prior to 2.9.0, the /cpanel/discounts administrative interface accepts negative fixed_amount discount values, persists them in sh_discounts, and passes them through vendor/shopper/cart/src/Discounts/DiscountCalculator.php and vendor/shopper/cart/src/Pipelines/Calculate.php without enforcing a positive-value invariant. Because the calculation subtracts discountTotal from the subtotal, a negative discount increases the resulting order total instead of reducing it. Malformed discount records can therefore cause incorrect pricing and financial data integrity failures, although the advisory does not establish a customer-facing exploitation path. This issue is fixed in version 2.9.0.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.004060000 probability, percentile 0.343980000 (date 2026-09-16)

Problem Types: CWE-20 | CWE-20 CWE-20: Improper Input Validation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Shopperlabs Shopper affected < 2.9.0 Not specified

References

ReferenceSourceLinkTags
github.com/shopperlabs/shopper/security/advisories/GHSA-5vf4-452p-jjhf 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/shopperlabs/shopper/releases/tag/v2.9.0 [email protected] github.com
github.com/shopperlabs/shopper/commit/967e616281ded1a0050d9102858ecd7dd7... [email protected] github.com
github.com/shopperlabs/shopper/pull/528 [email protected] github.com
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