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CVE-2026-88764— Simple Membership < 4.7.8 - Subscriber+ Membership Level Escalation via PayPal Standard subsc_ref

Quick assessment

Affected
Unknown Simple Membership
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Simple Membership WordPress 插件 4.7.8 之前的版本未验证 PayPal 支付通知中提供的会员等级是否与付费按钮配置的等级一致，导致会员可以以较低价格的会员进行支付，却被授予了更高权限的会员等级。

AI Predicted 7.2 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-88764

Vulnerability Information
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Vulnerability Title
Simple Membership < 4.7.8 - Subscriber+ Membership Level Escalation via PayPal Standard subsc_ref
Source: CVE Program / CVE List V5
Vulnerability Description
The Simple Membership WordPress plugin before 4.7.8 does not validate that the membership level supplied in a PayPal payment notification matches the level configured for the paid payment button, allowing members to pay for a lower-priced membership while being granted a higher, more privileged membership level.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unknown Simple Membership 0 ~ 4.7.8 -

II. Public POCs for CVE-2026-88764

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III. Intelligence Information for CVE-2026-88764

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Vendor Pages for CVE-2026-88764 (1)

Same Patch Batch · Unknown · 2026-09-13 · 9 CVEs total

CVE-2026-89080 Really Simple Security < 9.8.1 - Unauthenticated 2FA Bypass via Email Provider State Demot
CVE-2026-86407 User Registration & Membership < 5.2.8 - Unauthenticated User Data Disclosure via Membersh
CVE-2026-88912 rtMedia for WordPress, BuddyPress and bbPress < 4.7.12 - Subscriber+ Arbitrary Activity Pr
CVE-2026-88995 Bookit < 2.6.0.1 - Unauthenticated Appointment PII Disclosure via Availability Check
CVE-2026-77773 Social Contact Form (FormyChat) < 2.15.8 - Unauthenticated Gravity Forms Entry Disclosure
CVE-2026-86406 User Registration & Membership < 5.2.8 - Subscriber+ Privilege Escalation via Membership P
CVE-2026-80071 User Registration & Membership < 5.2.8 - Author+ Privilege Escalation to Administrator
CVE-2026-80072 User Registration & Membership < 5.2.8 - Unauthenticated Open Redirect via Login Redirect

IV. Related Vulnerabilities

Same product: Simple Membership
Same vendor: Unknown

V. Comments for CVE-2026-88764

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