CVE-2026-39355

Genealogy is Missing Authorization in `TeamController::transferOwnership()` Allows Any Authenticated User to Hijack Any Team (Broken Access Control)

State: Published
Severity: 10.0 Critical
Published: Apr 7, 2026
Updated: Apr 8, 2026
Reserved: Apr 6, 2026

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Description

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.

Scores

CVSS	Score	Vector	Source
3.1	10.0 Critical	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
genealogyMGeurts	< 5.9.1Affected

References

https://github.com/MGeurts/genealogy/security/advisories/GHSA-2rq7-jqm7-w8x4

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