CVE-2026-77470: CWE-20: Improper Input Validation in LycheeOrg Lychee
Description
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.
CVSS v4.0
Score 8.3high
Affected software
LycheeOrg
Lychee
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-20T20:07:49.962Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad1078e2cdf04f65648c5a9
Added to database: 10/15/2026, 17:04:14 UTC
Last updated: 10/15/2026, 17:04:14 UTC
Views: 1
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