CVE-2026-77470 Lychee: Webshop checkout lets the client override the payment `amount` sent to the gateway via malicious crafted POST request

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 additionaldata array and CheckoutService::preparePurchaseParameters merges it after server-computed purchase parameters. Because later...