Simple Membership <= 4.8.1 - Unauthenticated Authentication Bypass to Administrator Account Takeover via Multisite Identity Binding
Summary
| CVE | CVE-2026-77194 |
|---|---|
| State | PUBLISHED |
| Assigner | Wordfence |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-01 12:17:47 UTC |
| Updated | 2026-09-01 20:47:54 UTC |
| Description | The Simple Membership plugin for WordPress is vulnerable to Authentication Bypass leading to Administrator Account Takeover in versions up to, and including, 4.8.0. This is due to improper identity verification during the public registration flow in WordPress Multisite environments, where the plugin binds new Simple Membership records to existing global WordPress users based solely on matching username and email, without requiring password verification or ownership proof, and fails to properly detect Administrator roles on child sites. This makes it possible for unauthenticated attackers to take over Administrator accounts on child sites in a Multisite network by registering a Simple Membership account with a victim's credentials on a site where public registration is enabled, then updating the victim's global WordPress password through the profile edit functionality. The vulnerability was partially patched in version 4.8.1. |
Risk And Classification
Primary CVSS: v3.1 5.3 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS: 0.004240000 probability, percentile 0.354930000 (date 2026-09-03)
Problem Types: CWE-287 | CWE-287 CWE-287 Improper Authentication
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 5.3 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| 3.1 | CNA | DECLARED | 5.3 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
LowAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Wpinsider-1 | Simple Membership | affected 4.8.1 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| plugins.trac.wordpress.org/browser/simple-membership/tags/4.8.0/classes/class.swpm-utils... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/simple-membership/tags/4.8.0/classes/class.swpm-utils... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/simple-membership/tags/4.8.0/classes/class.swpm-front... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/changeset/3668897 | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/simple-membership/tags/4.8.0/classes/class.swpm-utils... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/simple-membership/tags/4.8.0/classes/class.swpm-form.php | [email protected] | plugins.trac.wordpress.org | |
| www.wordfence.com/threat-intel/vulnerabilities/id/ccd3eae5-3d30-4d0d-8f95-5f074... | [email protected] | www.wordfence.com | |
| plugins.trac.wordpress.org/changeset/3673368 | [email protected] | plugins.trac.wordpress.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Kittipat Jitphonchana (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-08-20T17:22:28.000Z | Vendor Notified |
| CNA | 2026-08-31T00:00:00.000Z | Disclosed |
There are currently no legacy QID mappings associated with this CVE.