CVE-2026-27397 MEDIUM

CVE-2026-27397: WordPress Really Simple Security Pro plugin <= 9.5.4.0 - Insecure Direct Object References (IDOR) vulnerability

Vendor Really Simple Plugins B.v.
Product Really Simple Security Pro
Weakness CWE-639 · IDOR
Published March 19, 2026
Last update April 28, 2026

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

Authorization Bypass Through User-Controlled Key vulnerability in Really Simple Plugins B.V. Really Simple Security Pro allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Really Simple Security Pro: from n/a through 9.5.4.0.

Explanation of Vulnerability in Simple Terms

02Summary

Really Simple Security Pro versions up to 9.5.4.0 contain a flaw that allows an attacker to modify data or disrupt service availability without authentication. The vulnerability requires only network access and no user interaction. Site administrators should update to a version newer than 9.5.4.0 to remediate the issue.

What an attacker can do

03Attacker Capabilities

Modify site data or cause temporary unavailability without needing to log in.

Potential impact on your site

04Site Impact

Attackers can alter content or temporarily disrupt your site without credentials.

Conditions required to exploit

05Prerequisites

Network access only; no authentication or user interaction required.

Key dates

06Disclosure timeline

March 19, 2026 CVE published
April 28, 2026 Record updated

Related vulnerabilities

08Related CVE