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CVE-2026-77468— Lychee: Missing Authentication for Critical Function and Allocation of Resources Without Limits or Throttling on /docs/api

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 是一款免费且开源的照片管理工具。在 7.7.0 版本之前，安装完成后，未经身份验证的用户即可通过 GET /docs/api 访问由 config/scramble.php 配置的、由 Scramble 生成的 OpenAPI 文档。从观察到的响应大小和延迟来看，该 API 模式似乎是在每次请求时重新生成，而未应用应用级别的缓存机制。远程攻击者可以通过反复请求此未限速的路由，大量消耗服务器 CPU 资源，并获取 API 表面及参数模式的详细映射信息。该问题已在 7.7.0 版本中得到修复。

CVSS 6.9 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
LycheeOrg Lychee < 7.7.0 affected
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I. Basic Information for CVE-2026-77468

Vulnerability Information
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Vulnerability Title
Lychee: Missing Authentication for Critical Function and Allocation of Resources Without Limits or Throttling on /docs/api
Source: CVE Program / CVE List V5
Vulnerability Description
Lychee is a free, open-source photo-management tool. Prior to 7.7.0, GET /docs/api exposes the Scramble-generated OpenAPI documentation configured by config/scramble.php to unauthenticated callers after installation, with observed response size and latency suggesting that the schema is regenerated without an application-level cache. A remote attacker can repeatedly request the unthrottled route to consume server CPU and obtain a detailed map of the API surface and parameter schema. This issue is fixed in version 7.7.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
LycheeOrg Lychee < 7.7.0 -

II. Public POCs for CVE-2026-77468

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III. Intelligence Information for CVE-2026-77468

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Other References for CVE-2026-77468 (4)

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-2026-77470 8.3 HIGH Lychee: Webshop checkout lets the client override the payment `amount` sent to the gateway
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-2026-57568 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-770

V. Comments for CVE-2026-77468

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