Premium SEO contains an unauthenticated administrative backdoor

Premium SEO is malicious software that ships an unauthenticated backdoor. The backdoor creates a hidden administrator account and some builds also enable remote code execution, server-side request forgery and arbitrary front-end script or content injection, giving an unauthenticated attacker control of the site. It marks all versions affected and identifies no safe release.

CVE / CNA score 10.0 CVSS 3.1 · contact@wpscan.com

NVD score Pending NVD has not published its own CVSS assessment.

Component: Premium SEO
Plugin slug: premium-seo
Affected: <= *
Safe version: See mitigation notes
Published: Aug 06, 2026
Weakness: CWE-912 — Hidden Functionality

This CVE was published Aug 06, 2026 and is one of 1 known issue for this plugin.

What to do

Update, patch or deactivate.

Remove Premium SEO completely rather than updating it. Treat any site where it was installed as compromised: investigate administrator accounts and file and database changes, rotate WordPress and hosting credentials, secrets and salts, and restore from a known-clean backup where appropriate.

No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical description

The Premium SEO WordPress plugin is malicious: it ships an unauthenticated backdoor that creates a hidden administrator account and, in some builds, also enables remote code execution, server-side request forgery and arbitrary front-end script/content injection, giving an unauthenticated attacker full control of the affected site.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References

Primary and upstream sources

Data attribution: This product uses the NVD API but is not endorsed or certified by the NVD.

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