CVE-2026-6443 CRITICAL

CVE-2026-6443: Essentialplugin Plugins (Various Versions) - Injected Backdoor

Vendor Essentialplugin
Product Accordion and Accordion Slider
Weakness CWE-506
Published April 17, 2026
Last update April 21, 2026

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

All plugins by Essentialplugin for WordPress are vulnerable to an injected backdoor in various versions. This is due to the plugin being sold to a malicious threat actor that embedded a backdoor in all of the plugin's they acquired. This makes it possible for the threat actor to maintain a persistent backdoor and inject spam into the affected sites.

Explanation of Vulnerability in Simple Terms

02Summary

Accordion and Accordion Slider versions 1.4.6 and earlier contain a vulnerability that allows unauthenticated attackers to read sensitive data, modify site content, or disrupt service without user interaction. The vulnerability is exploitable over the network with low complexity. No patch version is currently available.

What an attacker can do

03Attacker Capabilities

Read sensitive data, modify site content, or disrupt service without authentication.

Potential impact on your site

04Site Impact

Attackers can compromise your site's data, content, and availability without needing a user account.

Conditions required to exploit

05Prerequisites

Network access only; no authentication or user interaction required.

Key dates

06Disclosure timeline

April 17, 2026 CVE published
April 21, 2026 Record updated