Simple Membership <= 4.8.1 — Unauthenticated Authentication Bypass to Administrator Account Takeover via Multisite Identity Binding
CVE-2026-77194Published · Updated Action summary
Affected: ≤4.8.1Update to 4.8.2 or newer
All remediation steps- Severity
- Medium5.3
- CVSS
- 5.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-287 Improper Authentication
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Simple Membership simple-membership
- Affected≤ 4.8.1
- Patched in4.8.2
Update to 4.8.2 or newer.
You are affected if you run ≤ 4.8.1. Version 4.8.2 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Simple Membership.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 4.8.2, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Simple Membership to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Kittipat Jitphonchana.
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.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Simple Membership
All 39| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium6.4 | Authenticated (Subscriber+) Stored Cross-Site Scripting via Country Field ≤4.8.4Update to 4.8.5 | CVE-2026-103427 | |
| Low3.1 | Information Exposure ≤4.8.2Update to 4.8.3 | CVE-2026-88785 | |
| High7.5 | Missing Authorization to Unauthenticated Account Takeover and Sensitive Information Disclosure via 'email' Parameter on Activation Endpoints ≤4.8.3Update to 4.8.4 | CVE-2026-97337 | |
| Medium4.3 | Missing Authorization ≤4.8.2Update to 4.8.3 | CVE-2026-74000 | |
| Medium4.3 | Missing Authorization <4.7.8Update to 4.7.8 | CVE-2026-88764 |
- Medium6.4Authenticated (Subscriber+) Stored Cross-Site Scripting via Country Field
≤4.8.4Update to 4.8.5
- Low3.1Information Exposure
≤4.8.2Update to 4.8.3
- High7.5Missing Authorization to Unauthenticated Account Takeover and Sensitive Information Disclosure via 'email' Parameter on Activation Endpoints
≤4.8.3Update to 4.8.4
- Medium4.3Missing Authorization
≤4.8.2Update to 4.8.3
- Medium4.3Missing Authorization
<4.7.8Update to 4.7.8
Timeline
CVE published
Severity medium, CVSS 5.3
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.