Paper/Archive/CVE-2026-39355

CVE-2026-39355

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

EPSS 0.3%public exploit CVSS 10.0

critical.is priorityof 100

CVSS 10.0 (CNA)10.0 / 10 × 3030.0 Not in CISA KEV+300.0 EPSS percentile 24.5.245 × 204.9 Exploit: SSVC poc+1010.0 SSVC exploitation: poc+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

genealogy< 5.9.1–CNA

Scores by source

GitHub_M (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/MGeurts/genealogy/security/advisories/GHSA-2rq7-jqm7-w8x4