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CVE-2026-39957— Lychee has Broken Access Control in SharingController::listAll() leaks private album sharing metadata to unauthorized users

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 7.5.4之前版本存在安全漏洞，该漏洞源于SharingController::listAll()中的SQL运算符优先级错误，可能导致具有上传权限的认证非管理员用户检索所有基于用户组的共享权限。

AI Predicted 7.5 Difficulty: Easy EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2026-39957

Vulnerability Information
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Vulnerability Title
Lychee has Broken Access Control in SharingController::listAll() leaks private album sharing metadata to unauthorized users
Source: CVE Program / CVE List V5
Vulnerability Description
Lychee is a free, open-source photo-management tool. Prior to 7.5.4, a SQL operator-precedence bug in SharingController::listAll() causes the orWhereNotNull('user_group_id') clause to escape the ownership filter applied by the when() block. Any authenticated non-admin user with upload permission who owns at least one album can retrieve all user-group-based sharing permissions across the entire instance, including private albums owned by other users. This vulnerability is fixed in 7.5.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Lychee 安全漏洞
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 7.5.4之前版本存在安全漏洞，该漏洞源于SharingController::listAll()中的SQL运算符优先级错误，可能导致具有上传权限的认证非管理员用户检索所有基于用户组的共享权限。
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 < 7.5.4 -

II. Public POCs for CVE-2026-39957

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III. Intelligence Information for CVE-2026-39957

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Patches & Fixes for CVE-2026-39957 (1)

Vendor Advisories for CVE-2026-39957 (1)

IV. Related Vulnerabilities

Same product: Lychee
Same vendor: LycheeOrg
Same weakness: CWE-863

V. Comments for CVE-2026-39957

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