{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-56831", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-23T14:55:09.117Z", "datePublished": "2026-09-15T17:42:09.495Z", "dateUpdated": "2026-09-16T14:41:52.114Z"}, "containers": {"cna": {"title": "Shopper: Negative discount values accepted and propagated through order calculation pipeline", "problemTypes": [{"descriptions": [{"cweId": "CWE-20", "lang": "en", "description": "CWE-20: Improper Input Validation", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/shopperlabs/shopper/security/advisories/GHSA-5vf4-452p-jjhf", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/shopperlabs/shopper/security/advisories/GHSA-5vf4-452p-jjhf"}, {"name": "https://github.com/shopperlabs/shopper/pull/528", "tags": ["x_refsource_MISC"], "url": "https://github.com/shopperlabs/shopper/pull/528"}, {"name": "https://github.com/shopperlabs/shopper/commit/967e616281ded1a0050d9102858ecd7dd7f66a41", "tags": ["x_refsource_MISC"], "url": "https://github.com/shopperlabs/shopper/commit/967e616281ded1a0050d9102858ecd7dd7f66a41"}, {"name": "https://github.com/shopperlabs/shopper/releases/tag/v2.9.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/shopperlabs/shopper/releases/tag/v2.9.0"}], "affected": [{"vendor": "shopperlabs", "product": "shopper", "versions": [{"version": "< 2.9.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-15T17:42:09.495Z"}, "descriptions": [{"lang": "en", "value": "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": {"advisory": "GHSA-5vf4-452p-jjhf", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/shopperlabs/shopper/security/advisories/GHSA-5vf4-452p-jjhf", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-16T14:41:46.439666Z", "id": "CVE-2026-56831", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-16T14:41:52.114Z"}}]}}

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