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CVE-2026-86407— User Registration & Membership < 5.2.8 - Unauthenticated User Data Disclosure via Membership Thank You Page

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（用户注册与会员）WordPress 插件在 5.2.8 之前的版本中，未验证访问其会员确认页面的访客是否拥有请求中指定的账户，也未验证是否已发生注册或购买行为。这允许未认证的用户获取其他用户的电子邮件地址、个人资料字段、角色以及会员订单详情。利用该漏洞需要站点所有者在该页面的可配置消息中添加了用户智能标签（user smart tag），而插件默认提供的配置中并不包含此标签。

AI Predicted 4.3 Difficulty: Hard
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I. Basic Information for CVE-2026-86407

Vulnerability Information
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Vulnerability Title
User Registration & Membership < 5.2.8 - Unauthenticated User Data Disclosure via Membership Thank You Page
Source: CVE Program / CVE List V5
Vulnerability Description
The User Registration & Membership WordPress plugin before 5.2.8 does not verify that the visitor requesting its membership confirmation page owns the account named in the request, nor that any registration or purchase has taken place, allowing unauthenticated users to retrieve another user's email address, profile fields, role and membership order details. Exploitation requires the site owner to have added a user smart tag to that page's configurable message, which the shipped default does not contain.
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 5.0 ~ 5.2.8 -

II. Public POCs for CVE-2026-86407

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III. Intelligence Information for CVE-2026-86407

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Security Blog Posts for CVE-2026-86407 (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-2026-88764 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-2026-86406 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: User Registration & Membership
Same vendor: Unknown

V. Comments for CVE-2026-86407

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