Medium severity · published Apr 9, 2026
CVE-2026-39957
Lychee has Broken Access Control in SharingController::listAll() leaks private album sharing metadata to unauthorized users
4.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LY
Lychee · LycheeOrg
< 7.5.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-39957
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-39957
Patch
https://github.com/LycheeOrg/Lychee/commit/76a3f0513eca6458bf7f8c337c1ad65e59b22bcb
Issue Tracking
https://github.com/LycheeOrg/Lychee/pull/4264
Exploit
https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-4v4c-g2jv-4g25
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