{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-77470", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-08-20T20:07:49.962Z", "datePublished": "2026-10-15T16:36:09.597Z", "dateUpdated": "2026-10-15T18:30:17.464Z"}, "containers": {"cna": {"title": "Lychee: Webshop checkout lets the client override the payment `amount` sent to the gateway via malicious crafted POST request", "problemTypes": [{"descriptions": [{"cweId": "CWE-20", "lang": "en", "description": "CWE-20: Improper Input Validation", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-472", "lang": "en", "description": "CWE-472: External Control of Assumed-Immutable Web Parameter", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-915", "lang": "en", "description": "CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.3, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-476v-jr53-8rxc", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-476v-jr53-8rxc"}, {"name": "https://github.com/LycheeOrg/Lychee/pull/4514", "tags": ["x_refsource_MISC"], "url": "https://github.com/LycheeOrg/Lychee/pull/4514"}, {"name": "https://github.com/LycheeOrg/Lychee/commit/24e6e11f1da131ed20b192d7d7b7ca9084451a2f", "tags": ["x_refsource_MISC"], "url": "https://github.com/LycheeOrg/Lychee/commit/24e6e11f1da131ed20b192d7d7b7ca9084451a2f"}, {"name": "https://github.com/LycheeOrg/Lychee/releases/tag/v7.7.1", "tags": ["x_refsource_MISC"], "url": "https://github.com/LycheeOrg/Lychee/releases/tag/v7.7.1"}], "affected": [{"vendor": "LycheeOrg", "product": "Lychee", "versions": [{"version": "< 7.7.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-15T16:36:09.597Z"}, "descriptions": [{"lang": "en", "value": "Lychee is a free, open-source photo-management tool. Prior to 7.7.1, the Supporter or Pro webshop POST /api/v2/Shop/Checkout/Process flow accepts an unrestricted additional_data array and CheckoutService::preparePurchaseParameters() merges it after server-computed purchase parameters. Because later string keys overwrite earlier keys, an unauthenticated buyer can replace amount, currency, returnUrl, cancelUrl, or transactionId before CheckoutService::processPayment() passes the parameters to a non-PayPal Omnipay gateway. An attacker can therefore make a gateway accept a successful payment for an attacker-selected amount and obtain auto-fulfilled goods while underpaying the merchant. The issue requires an enabled webshop, a purchasable item, and an affected Omnipay gateway. This issue is fixed in version 7.7.1."}], "source": {"advisory": "GHSA-476v-jr53-8rxc", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-476v-jr53-8rxc", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-15T18:29:45.817503Z", "id": "CVE-2026-77470", "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": "2026-10-15T18:30:17.464Z"}}]}}

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