{
    "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"
                }
            }
        ]
    }
}