EUVD-2026-54181
GHSA-r59p-4mh6-5r64
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Unauthenticated network-reachable backdoor grants full admin/RCE with no interaction, and server compromise beyond the WordPress app justifies S:C with C:H/I:H/A:H.
Primary rating from Vendor (wpscan).
CVSS VectorVendor: wpscan
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Full unauthenticated site takeover in the Premium SEO WordPress plugin stems from an intentional backdoor shipped in the plugin code itself, which silently provisions a hidden administrator account and, in certain builds, exposes remote code execution, server-side request forgery, and arbitrary front-end content injection. Any WordPress site running this plugin is affected, and because the backdoor is reachable without authentication, an attacker who knows the endpoint gains complete control of the site. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The single hard prerequisite is that the target WordPress site must have the Premium SEO plugin installed and active - the backdoor is dormant code that only exists on sites that installed this specific malicious plugin. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H = 10.0) reflects the worst case: remote, low-complexity, unauthenticated, scope-changing full compromise, which is consistent with a deliberate backdoor rather than an accidental bug. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch is identified at time of analysis, and because the plugin is itself malicious, patching is not the remedy - remove it entirely. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all WordPress installations running the Premium SEO plugin, disable the plugin immediately on all affected sites, and pull access logs for indicators of unauthorized logins or administrative changes. …
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External POC / Exploit Code
Leaving vuln.today