CVE-2026-39957 Missing authorization in Lychee
Authenticated users can retrieve private album sharing metadata from other users due to a SQL logic error in the sharing controller.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-39957?
CVE-2026-39957 is a low-severity missing authorization vulnerability in LycheeOrg Lychee, published on 9 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-39957?
It affects 1 product.
Products include Lycheeorg Lychee.
How do I fix CVE-2026-39957?
No fix has been published for CVE-2026-39957 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-39957 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39957 exists.
Other vulnerabilities in LycheeOrg Lychee
- CVE-2023-52082 Lychee is vulnerable to an SQL Injection in explain DB queries.
- CVE-2024-25808 Cross-site request forgery in n/a
- CVE-2024-25807 Cross-site scripting in n/a
- CVE-2021-43675 Cross-site scripting in n/a
- CVE-2026-33537 Lychee has SSRF bypass via incomplete IP validation in Photo::fromUrl — loopback and link-local IPs not blocked
Sources
Also known as GHSA-4v4c-g2jv-4g25.