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CVE-2026-86406— User Registration & Membership < 5.2.8 - Subscriber+ Privilege Escalation via Membership Purchase

Quick assessment

Affected
Unknown User Registration & 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.

User Registration & Membership WordPress 插件在 5.2.8 版本之前，未检查发起会员购买操作的用户的权限（capability），也未验证所提交的支付方式及其关联的计划（plan）。这使得任意已认证用户（例如订阅者 subscriber）无需实际付费，即可获得已付费计划所关联的 WordPress 角色。如果站点管理员将某个计划映射到了具有较高权限的角色，这种漏洞可能导致权限提升，最高可提升至管理员（administrator）。

AI Predicted 7.3 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1098 · Account Manipulation
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I. Basic Information for CVE-2026-86406

Vulnerability Information
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Vulnerability Title
User Registration & Membership < 5.2.8 - Subscriber+ Privilege Escalation via Membership Purchase
Source: CVE Program / CVE List V5
Vulnerability Description
The User Registration & Membership WordPress plugin before 5.2.8 does not check the capability of the user making a membership purchase, and does not validate the payment method or the plan submitted with it, allowing any authenticated user such as a subscriber to be granted the WordPress role attached to a paid plan without paying for it. Where the site owner has mapped a plan to a privileged role, this leads to privilege escalation up to administrator.
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 User Registration & Membership 4.4.6 ~ 5.2.8 -

II. Public POCs for CVE-2026-86406

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III. Intelligence Information for CVE-2026-86406

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Vendor Advisories for CVE-2026-86406 (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-2026-88764 Simple Membership < 4.7.8 - Subscriber+ Membership Level Escalation via PayPal Standard su
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-2026-80071 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: User Registration & Membership
Same vendor: Unknown

V. Comments for CVE-2026-86406

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