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CVE-2026-56831

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

Description (CNA)

Shopper 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.

Affected (CNA)

Vendor / productVersions
shopperlabs / shopperaffected < 2.9.0

CWE

CWE-20

References

ADP enrichment

CISA-ADP

No English description supplied.