CVE-2026-77470 (GCVE-0-2026-77470)
Vulnerability from cvelistv5 – Published: 2026-10-15 16:36 – Updated: 2026-10-15 18:30
VLAI
EPSS
VEX
Title
Lychee: Webshop checkout lets the client override the payment `amount` sent to the gateway via malicious crafted POST request
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() 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.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 18:29 UTC
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/LycheeOrg/Lychee/security/advi… | x_refsource_CONFIRM |
| https://github.com/LycheeOrg/Lychee/pull/4514 | x_refsource_MISC |
| https://github.com/LycheeOrg/Lychee/commit/24e6e1… | x_refsource_MISC |
| https://github.com/LycheeOrg/Lychee/releases/tag/v7.7.1 | x_refsource_MISC |
Impacted products
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{
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"title": "Lychee: Webshop checkout lets the client override the payment `amount` sent to the gateway via malicious crafted POST request"
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}
],
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"lastModified": "2026-10-15T21:08:49.703",
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"modifiedSubAvailabilityImpact": "NOT_DEFINED",
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"modifiedUserInteraction": "NOT_DEFINED",
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"providerUrgency": "NOT_DEFINED",
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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