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CVE-2026-39355

Kreaweb Genealogy broken access control

9.9 CRITICALPublic exploitEPSS 0.44%
  1. Published7 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Kreaweb Genealogy< 5.9.1

Remediation

Fixed in
Kreaweb Genealogy≥ 5.9.1

References

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Frequently asked

Is CVE-2026-39355 being actively exploited?

CVE-2026-39355 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.44%.

How severe is CVE-2026-39355?

CVE-2026-39355 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.44% probability of exploitation.

Which products are affected by CVE-2026-39355?

Affected products include Kreaweb Genealogy.

How do I fix CVE-2026-39355?

Upgrade affected software to a fixed version, for example Kreaweb Genealogy 5.9.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-39355 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.