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CVE-2026-33537— Lychee has SSRF bypass via incomplete IP validation in Photo::fromUrl — loopback and link-local IPs not blocked

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The Lychee Organisation开源的一个漂亮且易于使用的照片管理系统。用于管理和共享照片。 Lychee 7.5.1之前版本存在代码问题漏洞，该漏洞源于IP验证检查不完整，未能阻止环回地址和链路本地地址，可能导致服务端请求伪造。

AI Predicted 7.8 Difficulty: Easy EPSS 0.30% · P21
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I. Basic Information for CVE-2026-33537

Vulnerability Information
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Vulnerability Title
Lychee has SSRF bypass via incomplete IP validation in Photo::fromUrl — loopback and link-local IPs not blocked
Source: CVE Program / CVE List V5
Vulnerability Description
Lychee is a free, open-source photo-management tool. The patch introduced for GHSA-cpgw-wgf3-xc6v (SSRF via `Photo::fromUrl`) contains an incomplete IP validation check that fails to block loopback addresses and link-local addresses. Prior to version 7.5.1, an authenticated user can still reach internal services using direct IP addresses, bypassing all four protection configuration settings even when they are set to their secure defaults. Version 7.5.1 contains a fix for the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Lychee 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Lychee是The Lychee Organisation开源的一个漂亮且易于使用的照片管理系统。用于管理和共享照片。 Lychee 7.5.1之前版本存在代码问题漏洞，该漏洞源于IP验证检查不完整，未能阻止环回地址和链路本地地址，可能导致服务端请求伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
LycheeOrg Lychee < 7.5.1 -

II. Public POCs for CVE-2026-33537

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III. Intelligence Information for CVE-2026-33537

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Patches & Fixes for CVE-2026-33537 (1)

Same Patch Batch · LycheeOrg · 2026-03-26 · 3 CVEs total

CVE-2026-33644 Lychee has SSRF bypass via DNS rebinding — PhotoUrlRule only validates IP addresses, not h
CVE-2026-33738 Lychee Vulnerable to Stored XSS via Photo Description in RSS/Atom/JSON Feed (No Sanitizati

IV. Related Vulnerabilities

Same product: Lychee
Same vendor: LycheeOrg
Same weakness: CWE-918

V. Comments for CVE-2026-33537

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