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

Quick assessment

Affected
essentialplugin Accordion and Accordion Slider
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Accordion and Accordion Slider 1.4.6版本存在安全漏洞，该漏洞源于插件被出售给恶意威胁行为者并嵌入了后门，可能导致威胁行为者维持持久后门并向受影响站点注入垃圾信息。

CVSS 9.8 · Critical EPSS 0.65% · P49
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I. Basic Information for CVE-2026-6443

Vulnerability Information
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Vulnerability Title
Essentialplugin Plugins (Various Versions) - Injected Backdoor
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
内嵌的恶意代码
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin Accordion and Accordion Slider 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Accordion and Accordion Slider 1.4.6版本存在安全漏洞，该漏洞源于插件被出售给恶意威胁行为者并嵌入了后门，可能导致威胁行为者维持持久后门并向受影响站点注入垃圾信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Shenlong Deep Dive — AI Deep Analysis

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Affected Products

Vendor Product Affected Versions CPE Subscribe
essentialplugin Accordion and Accordion Slider 1.4.6 -
essentialplugin Portfolio and Projects 1.5.6 -
essentialplugin Featured Post Creative 1.5.7 -
essentialplugin Post grid and filter ultimate 1.7.4 -
essentialplugin WP Featured Content and Slider 1.7.6 -
essentialplugin Post Ticker Ultimate 1.7.6 -
essentialplugin Trending/Popular Post Slider and Widget 1.8.6 -
essentialplugin Meta Slider and Carousel with Lightbox 2.0.8 -
essentialplugin Album and Image Gallery Plus Lightbox 2.1.8 -
essentialplugin Timeline and History slider 2.4.5 -
essentialplugin WP Blog and Widgets 2.6.6 -
essentialplugin Countdown Timer Ultimate 2.6.9 -
essentialplugin Blog Designer – Post and Widget 2.7.7 -
essentialplugin Team Slider and Team Grid Showcase plus Team Carousel 2.8.6 -
essentialplugin Video gallery and Player 2.8.7 -
essentialplugin Popup Maker and Popup Anything – Popup for opt-ins and Lead Generation Conversions 2.9.1 -
essentialplugin Testimonial Grid and Testimonial Slider plus Carousel with Rotator Widget 3.5.6 -
essentialplugin WP Responsive Recent Post Slider/Carousel 3.7.1 -
essentialplugin WP Slick Slider and Image Carousel 3.7.8.1 -
essentialplugin WP Logo Showcase Responsive Slider and Carousel 3.8.7 -
essentialplugin WP responsive FAQ with category plugin 3.9.5 -
essentialplugin WP News and Scrolling Widgets 5.0.6 -

II. Public POCs for CVE-2026-6443

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III. Intelligence Information for CVE-2026-6443

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Security Blog Posts for CVE-2026-6443 (1)

IV. Related Vulnerabilities

Same product: Accordion and Accordion Slider
Same vendor: essentialplugin
Same weakness: CWE-506

V. Comments for CVE-2026-6443

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