CVE-2026-56831: medium-severity vulnerability in shopperlabs shopper
Shopper: Negative discount values accepted and propagated through order calculation pipeline
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5epss 0.4%
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Affected products
shopperlabs · shopperRelated CVEs — shopperlabs shopper
In the same product, most dangerous first.
CVE-2026-56827HIGHShopper: Authorization bypass in Filament bulk actions allows browse-only staff to mass-delete attributes/tags and mass-toggle visibility of brands/categories/suppliersEPSS 0.5%CVE-2026-56829HIGHShopper: Unauthorized inventory stock manipulation via unlocked variant property in VariantStock componentEPSS 0.5%CVE-2026-56825HIGHShopper: Missing authorization on product removal actions in CollectionProducts componentEPSS 0.5%CVE-2026-56828HIGHShopper: read-only team permissions allow administrator creation and permission escalationEPSS 0.4%CVE-2026-56830MEDIUMShopper: Incomplete fix for GHSA-h4mp-g9c6-xwph: Media sub-form store() still lacks authorizationEPSS 0.4%CVE-2026-47743HIGHShopper: Multiple data integrity and disclosure issues in admin Livewire componentsEPSS 0.4%