CVE-2026-39571 MEDIUM

CVE-2026-39571: WordPress Instantio plugin <= 3.3.30 - Sensitive Data Exposure vulnerability

Vendor Themefic
Product Instantio
Weakness CWE-497
Published April 8, 2026
Last update April 29, 2026

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality Low
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

What the vulnerability does

01Description

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.

Explanation of Vulnerability in Simple Terms

02Summary

Instantio versions up to 3.3.30 expose sensitive information through improper access controls. An attacker on the network can read non-public data without authentication or user interaction. The vulnerability has a CVSS score of 5.3 (medium). Update to version 3.3.31 or later to remediate.

What an attacker can do

03Attacker Capabilities

Read sensitive information from the application without logging in.

Potential impact on your site

04Site Impact

Confidential data may be exposed to unauthenticated visitors.

Conditions required to exploit

05Prerequisites

Network access to the application; no authentication required.

Key dates

06Disclosure timeline

April 8, 2026 CVE published
April 29, 2026 Record updated

Related vulnerabilities

08Related CVE