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CVE-2026-6443 tracks an intentionally injected backdoor in version 1.4.6 of the Accordion and Accordion Slider plugin for WordPress, part of the Essential Plugin portfolio. According to the provided content, the malicious code was introduced after the plugin business was acquired by a threat actor. The backdoor was implemented in a module named wpos-analytics and exposed through an unauthenticated WordPress REST API endpoint configured with permission_callback set to __return_true. The execution chain contacted analytics.essentialplugin.com via file_get_contents(), passed the response directly to @unserialize(), and then invoked an attacker-controlled function through @$clean($this->version_cache, $this->changelog). This provided a remote, attacker-controlled code path via deserialization and arbitrary function execution. When activated, the malware fetched a disguised payload named wp-comments-posts.php and appended approximately 6 KB of obfuscated PHP to wp-config.php for persistence. The malicious functionality was also used to inject hidden SEO spam and redirects, reportedly targeting Googlebot selectively.
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An injected backdoor vulnerability in the Accordion and Accordion Slider plugin for WordPress version 1.4.6, introduced after the plugin was acquired by a malicious threat actor, allowing persistent backdoor access and spam injection on affected sites.
An intentionally injected PHP deserialization backdoor in the WordPress Accordion and Accordion Slider plugin version 1.4.6, enabling unauthenticated remote code execution via a malicious analytics module and REST API endpoint as part of a supply-chain compromise.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.