CVE-2026-77470

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.

• CWE-20
• CWE-472
• CWE-915

• https://github.com/LycheeOrg/Lychee/commit/24e6e11f1da131ed20b192d7d7b7ca9084451a2f
• https://github.com/LycheeOrg/Lychee/pull/4514
• https://github.com/LycheeOrg/Lychee/releases/tag/v7.7.1
• https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-476v-jr53-8rxc
• https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-476v-jr53-8rxc

Published

Oct 15, 2026

Last Modified

Oct 15, 2026

Status

Deferred

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