{"id":"CVE-2026-77470","title":"Lychee is a free, open-source photo-management tool","summary":"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() merg…","severity":"high","cvss":8.3,"cvssVector":"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","cwe":["CWE-20","CWE-472","CWE-915"],"vendor":"LycheeOrg","product":"Lychee","affected":["Lychee < 7.7.1"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T19:17:43.390","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77470","references":[{"url":"https://github.com/LycheeOrg/Lychee/commit/24e6e11f1da131ed20b192d7d7b7ca9084451a2f","label":"security-advisories@github.com"},{"url":"https://github.com/LycheeOrg/Lychee/pull/4514","label":"security-advisories@github.com"},{"url":"https://github.com/LycheeOrg/Lychee/releases/tag/v7.7.1","label":"security-advisories@github.com"},{"url":"https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-476v-jr53-8rxc","label":"security-advisories@github.com"},{"url":"https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-476v-jr53-8rxc","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-15T18:29:45.817503Z"},"cvssSource":"cna","ingestedAt":"2026-10-15T17:18:20.101Z","slug":"CVE-2026-77470","body":"## Overview\n\nLychee 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":58,"depthScoreParts":{"impact":45.7,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":222681,"id":"CVE-2026-77470","ts":1792092519746,"field":"exploit_available","old":"false","new":"true"}]}