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CVE-2026-14812 – Unauthenticated Backdoor (Hidden Admin / RCE / SSRF) – Premium SEO WordPress Plugin

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Summary

CVE-2026-14812 is a maximum-severity (CVSS 10.0) flaw in the Premium SEO WordPress plugin, which ships with an embedded malicious backdoor. The plugin allows an unauthenticated, remote attacker to create a hidden administrator account and, in some builds, to achieve remote code execution, server-side request forgery, and arbitrary front-end content injection — resulting in full site compromise.

Technical details

  • Root cause: The plugin itself is malicious, containing an intentional backdoor implemented in wp-content/plugins/Premium-SEO/seo-automation.php.
  • Trigger conditions: No authentication is required. An attacker sends crafted unauthenticated HTTP requests to backdoor endpoints — for example an Action=checkfiles request that provisions a hidden administrator account (observed accounts use a resource_desk_* prefix and the email [email protected]).
  • Attack vector: Network. Additional backdoor behaviors reported across builds include remote code execution via a plugin-file overwrite (Action=update), SSRF through request parameters, and injection of doorway pages and scripts pulled from external command-and-control hosts (public.imagehosting.space, public1.imagehosting.space).
  • Impact: Complete confidentiality, integrity, and availability loss — an unauthenticated attacker gains full administrative control of the affected WordPress site.

Affected software

  • Premium SEO WordPress plugin builds 6.x, 30, 36, 37, and 38.

Severity

  • CVSS v3.1 base score: 10.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: There is no known fixed version. Remove the Premium SEO plugin entirely from any affected WordPress site.
  • Remediation: Delete any planted administrator accounts (e.g. those with a resource_desk_* prefix or the email [email protected]), audit the site for injected doorway pages and malicious head/footer scripts, and block outbound traffic to the identified command-and-control hosts.
  • If removal is not immediately possible: Restrict network access to the affected site and monitor for the backdoor request patterns and unexpected administrator account creation.

References

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