Accordion and Accordion Slider - CraftedSignal Threat Feedhttps://feed.craftedsignal.io/products/accordion-and-accordion-slider/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioWed, 03 Jan 2024 12:00:00 +0000Compromised WordPress Plugin 'Accordion and Accordion Slider' Delivers Backdoorhttps://feed.craftedsignal.io/briefs/2024-01-wordpress-backdoor/Wed, 03 Jan 2024 12:00:00 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2024-01-wordpress-backdoor/A malicious actor injected a backdoor into the WordPress 'Accordion and Accordion Slider' plugin version 1.4.6 after purchasing it, allowing for persistence and spam injection.In April 2026, the WordPress plugin 'Accordion and Accordion Slider' version 1.4.6 was found to contain a malicious backdoor. This occurred after the plugin was sold to an unknown threat actor who systematically injected backdoors into multiple WordPress plugins they acquired. The purpose of this backdoor is to maintain persistent access to compromised websites and inject spam content, potentially damaging the reputation and SEO ranking of affected sites. The vulnerability is tracked as CVE-2026-6443 and has a CVSS v3.1 score of 9.8, indicating a critical risk. Defenders should immediately identify and remove the affected plugin version from their WordPress installations.

Attack Chain

  1. Plugin Acquisition: The threat actor purchases the 'Accordion and Accordion Slider' plugin.
  2. Backdoor Injection: Malicious code is embedded within the plugin's codebase.
  3. Plugin Update/Distribution: The compromised version 1.4.6 is released and distributed to users via the WordPress plugin repository or other distribution channels.
  4. Installation/Update: Users install or update to the backdoored version of the plugin on their WordPress sites.
  5. Backdoor Activation: The injected code executes within the WordPress environment, establishing a persistent backdoor.
  6. C2 Communication: The backdoor establishes communication with a command-and-control (C2) server (domain/IP is unknown).
  7. Spam Injection: The attacker injects spam content into the website, potentially modifying posts, pages, or database entries.
  8. Persistence Maintenance: The backdoor ensures continued access, allowing for ongoing spam injection and potential further compromise.

Impact

Successful exploitation allows the attacker to inject arbitrary spam content into WordPress websites. This can lead to defacement, SEO penalties, and reputational damage. Given the widespread use of WordPress and the compromised plugin, a significant number of websites could be affected. The injected spam can vary in nature and content, potentially leading to further malicious activities.

Recommendation

  • Identify installations of 'Accordion and Accordion Slider' version 1.4.6 and immediately remove the plugin to prevent further compromise (reference: CVE-2026-6443).
  • Monitor web server logs (category: webserver, product: linux/windows) for unexpected POST requests or modifications to WordPress core files, indicative of backdoor activity.
  • Deploy the Sigma rule "Detect Suspicious WordPress Plugin Activity" to identify potentially malicious plugin behavior (reference: rules).
  • Review WordPress database content for injected spam or unauthorized modifications (reference: overview).
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