Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%

Buy Us a Coffee

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

Quick assessment

Affected

LycheeOrg Lychee

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Lychee 是一款免费的开源照片管理工具。在 7.7.1 版本之前，Supporter 或 Pro 电商模块的 POST /api/v2/Shop/Checkout/Process 流程中，允许传递不受限制的 additional_data 数组，并且 CheckoutService::preparePurchaseParameters() 方法会在服务端计算好的购买参数之后合并该数组。由于后面的字符串键值会覆盖前面的键值，未认证的买家可以在 CheckoutService::processPayment() 将

CVSS 8.3 · High Updated Oct 16, 2026

Possible ATT&CK Techniques 2 AI

T1204 · User Execution T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

Vendor	Product	Version Range	Status
LycheeOrg	Lychee	`< 7.7.1`	affected

Get alerts for future matching vulnerabilities Log in to subscribe

Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title

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

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

输入验证不恰当

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
LycheeOrg	Lychee	< 7.7.1	-

II. Public POCs for CVE-2026-77470

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-77470

请登录查看更多情报信息。

Same Patch Batch · LycheeOrg · 2026-10-15 · 10 CVEs total

CVE-2026-62679	8.9 HIGH	Lychee: Path traversal in `SecurePathController` allows authenticated arbitrary file read
CVE-2026-77466	8.3 HIGH	Lychee: Webshop payment bypass via unrestricted "Dummy" gateway selection
CVE-2026-61838	8.2 HIGH	Lychee: Album password bypass in ZIP downloads
CVE-2026-61611	7.5 HIGH	Lychee: Missing rate limiting on album password unlock endpoint allows brute-force attacks
CVE-2026-77467	7.1 HIGH	Lychee: A single 383-byte PDF causes ~184 seconds of CPU consumption in the real processin
CVE-2026-77468	6.9 MEDIUM	Lychee: Missing Authentication for Critical Function and Allocation of Resources Without L
CVE-2026-57568	5.7 MEDIUM	Lychee: Stored XSS via Markdown javascript: Links in Photo and Album Descriptions (Gallery
CVE-2026-57569	2.3 LOW	Lychee: Distinct post-fix SSRF variant in Photo::fromUrl due to missing IP pinning after D
CVE-2026-61610	2.3 LOW	Lychee: unauthenticated photo starring reveals existence of private photos when photos_sta

IV. Related Vulnerabilities

Same product: Lychee

Same vendor: LycheeOrg

Same weakness: CWE-20

V. Comments for CVE-2026-77470

No comments yet

Goal Reached Thanks to every supporter — we hit 100%!

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

Quick assessment

Possible ATT&CK Techniques 2 AI

Affected Version Matrix 1

I. Basic Information for CVE-2026-77470

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-77470

III. Intelligence Information for CVE-2026-77470

Patches & Fixes for CVE-2026-77470 (2)

Vendor Advisories for CVE-2026-77470 (1)

Vendor Pages for CVE-2026-77470 (1)

Same Patch Batch · LycheeOrg · 2026-10-15 · 10 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2026-77470

Leave a comment