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CVE-2026-56831— Shopper: Negative discount values accepted and propagated through order calculation pipeline

Quick assessment

Affected
shopperlabs shopper
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Shopper 是一个无头（Headless）电子商务后台管理系统。在 2.9.0 版本之前，/cpanel/discounts 管理接口接受负数的固定折扣金额（fixed_amount），并将其持久化存储到 sh_discounts 表中。随后，这些值经由 vendor/shopper/cart/src/Discounts/DiscountCalculator.php 和 vendor/shopper/cart/src/Pipelines/Calculate.php 处理，但在整个过程中并未强制执行“折扣金额必须

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
shopperlabs shopper < 2.9.0 affected
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I. Basic Information for CVE-2026-56831

Vulnerability Information
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Vulnerability Title
Shopper: Negative discount values accepted and propagated through order calculation pipeline
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
shopperlabs shopper < 2.9.0 -

II. Public POCs for CVE-2026-56831

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III. Intelligence Information for CVE-2026-56831

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Patches & Fixes for CVE-2026-56831 (2)

Vendor Advisories for CVE-2026-56831 (1)

Vendor Pages for CVE-2026-56831 (1)

Same Patch Batch · shopperlabs · 2026-09-15 · 5 CVEs total

CVE-2026-56827 8.1 HIGH Shopper: Authorization bypass in Filament bulk actions allows browse-only staff to mass-de
CVE-2026-56825 8.1 HIGH Shopper: Missing authorization on product removal actions in CollectionProducts component
CVE-2026-56829 8.1 HIGH Shopper: Unauthorized inventory stock manipulation via unlocked variant property in Varian
CVE-2026-56830 6.5 MEDIUM Shopper: Incomplete fix for GHSA-h4mp-g9c6-xwph: Media sub-form store() still lacks author

IV. Related Vulnerabilities

Same product: shopper
Same vendor: shopperlabs
Same weakness: CWE-20

V. Comments for CVE-2026-56831

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