CVE Intelligence
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CVE-2026-6443: Essentialplugin WordPress Plugins: Embedded Backdoor (CWE-506)

Wordfence reports that all Essentialplugin plugins for WordPress contain an injected backdoor, reportedly added after the plugin was sold to a malicious actor. The backdoor is described as enabling persistent access and spam injection. The record assigns a CVSS 3.1 score of 9.8 and lists no confirmed active exploitation in the sources consulted.

Published Oct 13, 2026 · Updated Oct 13, 2026 · Ler em português

Overview

The record describes an injected backdoor affecting all plugins by Essentialplugin for WordPress in various versions. According to the description, the plugin was sold to a malicious threat actor who embedded a backdoor in every plugin they acquired.

Impact

  • The description states the backdoor lets the actor maintain persistent access.
  • The description states it can be used to inject spam into affected sites.
  • Wordfence assigned a CVSS 3.1 base score of 9.8 (Critical), reflecting network attack vector, no privileges or user interaction required, and high confidentiality, integrity and availability impact.

Affected products and versions

  • The record does not list specific affected or fixed versions; the description refers only to 'various versions'.
  • The known scope is limited to Essentialplugin plugins described in the record.

Exploitation status

  • The record does not show this CVE as listed in CISA KEV.
  • No confirmed active exploitation appears in the sources consulted.

Remediation and mitigation

  • No fixed version is listed in the record. The absence of fix data does not mean no fix exists.
  • Check the Wordfence advisory and the referenced article for current guidance.
  • If Essentialplugin software is installed, treat the site as potentially compromised: identify and remove the plugins, review the site for unauthorized changes, and replace them only from a verified source.
  • Rotate administrative and hosting credentials after cleanup.

Detection guidance

  • Review installed plugins for Essentialplugin products and for unexpected changes to plugin files.
  • Look for unfamiliar administrator accounts, unexpected scheduled tasks, and unusual spam output or redirects.
  • Compare site files against a known clean backup.

Limitations of the available information

  • The record does not specify affected or fixed versions, individual plugin names, the technical behavior of the backdoor, or indicators of compromise.
  • The referenced article was not analyzed in detail; any facts beyond the record are unknown.

Frequently asked questions

Is this vulnerability being actively exploited?

CISA KEV does not list it in the record, and no confirmed active exploitation appears in the sources consulted.

Which versions are affected?

The record only says 'various versions' of Essentialplugin plugins and does not list specific affected or fixed versions.

What should WordPress site owners do?

Identify any Essentialplugin software, remove it, review the site for unauthorized changes, and rotate credentials. Check the Wordfence advisory for updated guidance.

This analysis was drafted with AI assistance from verified source data and automatically checked against it.