What is CVE-2026-39571?

CVE-2026-39571 is a medium-severity vulnerability in Themefic Instantio, classified under Exposure of Sensitive System Information to an Unauthorized Control Sphere. CVSS score: 5.3/10. Published 2026-04-08.

How severe is CVE-2026-39571?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Themefic Instantio

CVE-2026-39571

Exposure of Sensitive System Information to an Unauthorized Control Sphere vulnerability in Themefic Instantio instantio allows Retrieve Embedded Sensitive Data.This issue affects Instantio: from n/a through <= 3.3.30.

EPSS: 0.000 (12.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Themefic Instantio — versions 0

Weakness classification (CWE)

CWE-497 — Exposure of Sensitive System Information to an Unauthorized Control Sphere

References

patchstack.com/database/Wordpress/Plugin/instantio/vulnerability/wordpress-inst… (vdb-entry)

Frequently asked questions

What is CVE-2026-39571?: CVE-2026-39571 is a medium-severity vulnerability in Themefic Instantio, classified under Exposure of Sensitive System Information to an Unauthorized Control Sphere. CVSS score: 5.3/10. Published 2026-04-08.
How severe is CVE-2026-39571?: Medium severity. CVSS v3 base score is 5.3 out of 10.