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CVE-2026-103427— Simple Membership <= 4.8.4 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Country Field

Quick assessment

Affected
wpinsider-1 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.

WordPress 的 Simple Membership 插件在 4.8.4 及所有更早版本中存在存储型跨站脚本（Stored Cross-Site Scripting, XSS）漏洞，原因是 'country' 参数缺乏足够的输入清理和输出转义。这使得具有订阅者（subscriber）级别及以上权限的已认证攻击者能够在页面中注入任意 Web 脚本，每当用户访问被注入的页面时，这些脚本就会被执行。 此外，如果插件中启用了“启用免费会员注册”（Enable Free Membership）功能，未认证的攻击者也可能

CVSS 6.4 · Medium EPSS 0.21% · P10

Affected Version Matrix 1

VendorProduct Version RangeStatus
wpinsider-1 Simple Membership ≤ 4.8.4 affected
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I. Basic Information for CVE-2026-103427

Vulnerability Information
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Vulnerability Title
Simple Membership <= 4.8.4 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Country Field
Source: CVE Program / CVE List V5
Vulnerability Description
The Simple Membership plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'country' parameter in all versions up to, and including, 4.8.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Unauthenticated attackers may also exploit this vulnerability when the plugin's Enable Free Membership feature is turned on, as it permits anonymous front-end registration and profile submission.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
wpinsider-1 Simple Membership 0 ~ 4.8.4 -

II. Public POCs for CVE-2026-103427

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III. Intelligence Information for CVE-2026-103427

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Patches & Fixes for CVE-2026-103427 (2)

News Coverage for CVE-2026-103427 (1)

Other References for CVE-2026-103427 (1)

IV. Related Vulnerabilities

Same product: Simple Membership
Same vendor: wpinsider-1
Same weakness: CWE-79

V. Comments for CVE-2026-103427

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