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CVE-2026-39355

CRITICAL CVSS 3.1: 9.9
Updated Apr 07, 2026
PHP
Parameter Value
CVSS 9.9 (CRITICAL)
Fixed In 5.9.1
Type CWE-862 (Missing Authorization)
Vendor PHP
Public PoC No

Genealogy is a family tree PHP application. Prior to 5.9.1, a critical broken access control vulnerability in the genealogy application allows any authenticated user to transfer ownership of arbitrary non-personal teams to themselves. This enables complete takeover of other users’ team workspaces and unrestricted access to all genealogy data associated with the compromised team.

This vulnerability is fixed in 5.9.1.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1