Simple Membership <= 4.7.7 - Unauthenticated Stored Cross-Site Scripting

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7.2
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2026-15931
CVSS 7.2 (High)
Publicly Published July 24, 2026
Last Updated August 15, 2026
Researcher Yaswanth Reddy Sunkara

Description

The Simple Membership plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 4.7.7 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.

References

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Vulnerability Details for Simple Membership

Simple Membership

Software Type Plugin
Software Slug simple-membership (view on wordpress.org)
Patched? Yes
Remediation Update to version 4.7.8, or a newer patched version
Affected Version
  • <= 4.7.7
Patched Version
  • 4.7.8

Recent vulnerabilities in Simple Membership

Simple Membership <= 4.8.4 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Country Field
6.4
CVE-2026-103427
Oct 9, 2026
Researcher: Maciej Komorowski
Simple Membership <= 4.8.3 - Missing Authorization to Unauthenticated Account Takeover and Sensitive Information Disclosure via 'email' Parameter on Activation Endpoints
7.5
CVE-2026-97337
Oct 2, 2026
Researcher: Kuba
Simple Membership <= 4.8.2 - Missing Authorization
4.3
CVE-2026-74000
Sep 16, 2026
Researcher: Ananda Dhakal
Simple Membership < 4.7.8 - Missing Authorization
4.3
CVE-2026-88764
Sep 11, 2026
Researcher: Charles Vosburgh
Simple Membership <= 4.8.1 - Unauthenticated Authentication Bypass to Administrator Account Takeover via Multisite Identity Binding
5.3
CVE-2026-77194
Aug 31, 2026
Researcher: Kittipat Jitphonchana
Simple Membership <= 4.7.8 - Missing Authorization
5.3
CVE-2026-66712
Aug 5, 2026
Researcher: Ananda Dhakal
Simple Membership <= 4.7.7 - Missing Authorization
5.3
CVE-2026-15930
Jul 24, 2026
Researcher: Brandon Steed
Simple Membership <= 4.7.6 - Unauthenticated Payment Verification Bypass
5.3
CVE-2026-14936
Jul 13, 2026
Researcher: Muni Nitish Kumar Yaddala
Simple Membership <= 4.7.5 - Missing Authorization to Unauthenticated Arbitrary Member Account Deactivation via Forged Stripe 'charge.refunded' Webhook
5.3
CVE-2026-12093
Jun 17, 2026
Researcher: Nikita Fenko
Simple Membership <= 4.7.4 - Unauthenticated Stored Cross-Site Scripting
7.2
CVE-2026-11855
Jun 15, 2026
Researcher: Duy Tran
# Title CVE ID CVSS Researchers Date
1 Simple Membership <= 4.8.4 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Country Field CVE-2026-103427 6.4 Maciej Komorowski October 9, 2026
2 Simple Membership <= 4.8.3 - Missing Authorization to Unauthenticated Account Takeover and Sensitive Information Disclosure via 'email' Parameter on Activation Endpoints CVE-2026-97337 7.5 Kuba October 2, 2026
3 Simple Membership <= 4.8.2 - Missing Authorization CVE-2026-74000 4.3 Ananda Dhakal September 16, 2026
4 Simple Membership < 4.7.8 - Missing Authorization CVE-2026-88764 4.3 Charles Vosburgh September 11, 2026
5 Simple Membership <= 4.8.1 - Unauthenticated Authentication Bypass to Administrator Account Takeover via Multisite Identity Binding CVE-2026-77194 5.3 Kittipat Jitphonchana August 31, 2026
6 Simple Membership <= 4.7.8 - Missing Authorization CVE-2026-66712 5.3 Ananda Dhakal August 5, 2026
7 Simple Membership <= 4.7.7 - Missing Authorization CVE-2026-15930 5.3 Brandon Steed July 24, 2026
8 Simple Membership <= 4.7.6 - Unauthenticated Payment Verification Bypass CVE-2026-14936 5.3 Muni Nitish Kumar Yaddala July 13, 2026
9 Simple Membership <= 4.7.5 - Missing Authorization to Unauthenticated Arbitrary Member Account Deactivation via Forged Stripe 'charge.refunded' Webhook CVE-2026-12093 5.3 Nikita Fenko June 17, 2026
10 Simple Membership <= 4.7.4 - Unauthenticated Stored Cross-Site Scripting CVE-2026-11855 7.2 Duy Tran June 15, 2026
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