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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.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Raw HTTP response body: /wp-content/plugins/Premium-SEO/

References

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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
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