What is CVE-2026-39573?

CVE-2026-39573 is a high-severity vulnerability in Select-themes Mildhill, classified under Deserialization of Untrusted Data. CVSS score: 8.1/10. Published 2026-06-17.

How severe is CVE-2026-39573?

High severity. CVSS v3 base score is 8.1 out of 10.

Deserialization in Select-themes Mildhill

CVE-2026-39573

Unauthenticated PHP Object Injection in Mildhill <= 1.5 versions.

Vulnerability class: Insecure Deserialization

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Select-themes Mildhill — versions n/a

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

audit@patchstack.com (vdb-entry)

Frequently asked questions

What is CVE-2026-39573?: CVE-2026-39573 is a high-severity vulnerability in Select-themes Mildhill, classified under Deserialization of Untrusted Data. CVSS score: 8.1/10. Published 2026-06-17.
How severe is CVE-2026-39573?: High severity. CVSS v3 base score is 8.1 out of 10.