CVE-2026-77194 json
Simple Membership <= 4.8.1 - Unauthenticated Authentication Bypass to Administrator Account Takeover via Multisite Identity Binding
published 2026-09-01 2 mo ago modified 2026-09-01 2 mo ago also EUVD-2026-69022
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 48%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected products
- wpinsider-1 Simple Membership
Classification
- Weakness
-
- CWE-287 Improper Authentication
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/ccd3eae5-3d30-4d0d-8f95-5f0747e4e944?source=cve
- plugins.trac.wordpress.org /browser/simple-membership/tags/4.8.0/classes/class.swpm-utils.php#L329
- plugins.trac.wordpress.org /browser/simple-membership/tags/4.8.0/classes/class.swpm-utils-member.php#L461
- plugins.trac.wordpress.org /browser/simple-membership/tags/4.8.0/classes/class.swpm-utils.php#L365
- plugins.trac.wordpress.org /browser/simple-membership/tags/4.8.0/classes/class.swpm-front-registration.php#L126
- plugins.trac.wordpress.org /browser/simple-membership/tags/4.8.0/classes/class.swpm-form.php#L214
- plugins.trac.wordpress.org /changeset/3668897/
- plugins.trac.wordpress.org /changeset/3673368/
Sources
- CVE List CVE-2026-77194
- NVD CVE-2026-77194
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