How severe is CVE-2026-39355?

CVE-2026-39355 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-39355 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39355?

CVE-2026-39355 affects Kreaweb Genealogy. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39355?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-39355 have an EU (EUVD) identifier?

Yes. CVE-2026-39355 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19865.

When was CVE-2026-39355 published?

CVE-2026-39355 was published on 2026-04-07 and last updated on 2026-06-17.

CVE-2026-39355

CVE-2026-39355 is a critical-severity vulnerability in Kreaweb Genealogy with a CVSS 3.x base score of 9.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19865
Weakness: CWE-862
Affected product: Kreaweb Genealogy
Published: 2026-04-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-39355?: 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.
How severe is CVE-2026-39355?: CVE-2026-39355 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-39355 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39355?: CVE-2026-39355 affects Kreaweb Genealogy. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39355?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-39355 have an EU (EUVD) identifier?: Yes. CVE-2026-39355 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19865.
When was CVE-2026-39355 published?: CVE-2026-39355 was published on 2026-04-07 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:kreaweb:genealogy:*:*:*:*:*:*:*:*

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CVE-2025-55288 — Medium (CVSS 5.5): Genealogy is a family tree PHP application. Prior to 4.4.0, Authenticated Reflected Cross-Site Scripting (XSS)…
CVE-2025-55287 — Medium (CVSS 5.4): Genealogy is a family tree PHP application. Prior to 4.4.0, Authenticated Stored Cross-Site Scripting (XSS)…

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