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CVE-2026-11855— Simple Membership < 4.7.5 - Unauthenticated Stored XSS via Stripe Webhook API Version

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.

Wpinsider-1 Simple Membership是Wpinsider-1公司的一款专注于用户注册与访问管理的 WordPress 插件，主要用途是为网站添加会员功能，支持用户注册、登录、内容访问限制等典型操作。 Wpinsider-1 Simple Membership 4.7.5之前版本存在跨站脚本漏洞，该漏洞源于未验证Stripe webhook请求的真实性且未转义输出值，可能导致未经身份验证的攻击者注入任意Web脚本，在管理员登录环境中执行。

AI Predicted 8.1 Difficulty: Easy EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown Simple Membership < 4.7.5 affected
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I. Basic Information for CVE-2026-11855

Vulnerability Information
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Vulnerability Title
Simple Membership < 4.7.5 - Unauthenticated Stored XSS via Stripe Webhook API Version
Source: CVE Program / CVE List V5
Vulnerability Description
The Simple Membership WordPress plugin before 4.7.5 does not verify the authenticity of Stripe webhook requests when no signing secret is configured, nor escape a value taken from them before outputting it in an administrator notice, allowing unauthenticated attackers to inject arbitrary web scripts that execute in the context of a logged-in 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
Vulnerability Title
Wpinsider-1 Simple Membership 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Wpinsider-1 Simple Membership是Wpinsider-1公司的一款专注于用户注册与访问管理的 WordPress 插件，主要用途是为网站添加会员功能，支持用户注册、登录、内容访问限制等典型操作。 Wpinsider-1 Simple Membership 4.7.5之前版本存在跨站脚本漏洞，该漏洞源于未验证Stripe webhook请求的真实性且未转义输出值，可能导致未经身份验证的攻击者注入任意Web脚本，在管理员登录环境中执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unknown Simple Membership 0 ~ 4.7.5 -

II. Public POCs for CVE-2026-11855

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III. Intelligence Information for CVE-2026-11855

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Vendor Advisories for CVE-2026-11855 (1)

Same Patch Batch · Unknown · 2026-07-06 · 7 CVEs total

CVE-2026-6382 Multiple elFinder Plugins - Authenticated OS Command Injection
CVE-2026-11962 FileOrganizer < 1.2.0 - Authenticated Arbitrary File Upload via elFinder File Operations
CVE-2026-12083 Admin and Site Enhancements < 8.8.4 - Unauthenticated Administrator-Role Restoration via r
CVE-2026-11766 Ultimate Member < 2.12.0 - Subscriber+ Stored XSS via Custom Textarea Profile Fields
CVE-2026-10830 AllCoach < 1.0.2 - Unauthenticated Account Takeover
CVE-2024-6228 WANotifier < 2.6 - Subscriber+ LFI

IV. Related Vulnerabilities

Same product: Simple Membership
Same vendor: Unknown

V. Comments for CVE-2026-11855

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