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TI-2026-28813 Aliases CVE-2026-39957

Incorrect authorization in LycheeOrg Lychee

Priority MEDIUM 45CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00211 11th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Lychee (LycheeOrg): 7.5.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LycheeOrgLycheebefore 7.5.47.5.4Patch availableCNA
  • Lychee VendorLycheeOrg Affected before 7.5.4 Fixed in 7.5.4 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:lycheeorg:lychee:*:*:*:*:*:*:*:*before 7.5.4VulnerableLycheeOrg
  • cpe:2.3:a:lycheeorg:lychee:*:*:*:*:*:*:*:* Versions before 7.5.4 Vulnerable ·LycheeOrg

Remediation

  • Fix · CNA Lychee (LycheeOrg) Fixed in 7.5.4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-39957

References

Exploit 1

Patch 2

  • TI-2024-16953 Cross-site Request Forgery (CSRF) vulnerability in Lychee version 3.1.6, allows remote… CVSS 3.1HIGH 8.3
  • TI-2024-16952 Cross Site Scripting (XSS) vulnerability in Lychee 3.1.6, allows remote attackers to… CVSS 3.1MEDIUM 6.1
  • TI-2026-25930 Lychee has SSRF bypass via incomplete IP validation in Photo::fromUrl — loopback and link-local IPs not blocked CVSS 4.0MEDIUM 5.3
  • TI-2026-26117 Lychee Vulnerable to Stored XSS via Photo Description in RSS/Atom/JSON Feed (No Sanitization on Public Endpoint) CVSS 4.0MEDIUM 4.8
  • TI-2023-28525 Lychee is vulnerable to an SQL Injection in explain DB queries. CVSS 3.1CRITICAL 9.8
  • TI-2021-19511 Lychee-v3 3.2.16 is affected by a Cross Site Scripting (XSS) vulnerability in… CVSS 3.1MEDIUM 6.1
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences