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CVE-2026-87111— User Registration PRO <= 6.2.9 - Unauthenticated Stored Cross-Site Scripting via HTTP Referer Header

Quick assessment

Affected
WPEverest User Registration PRO – Custom Registration Form, Login Form, and User Profile WordPress Plugin
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 插件"User Registration PRO – Custom Registration Form, Login Form, and User Profile"在所有 6.2.9 及更早版本中，由于输入清理和输出转义不足，存在通过 HTTP Referer 请求头触发的存储型跨站脚本（Stored XSS）漏洞。该漏洞允许未认证的攻击者在页面上注入任意 Web 脚本，当用户访问被注入的页面时，这些脚本将被执行。此漏洞仅存在于该插件的高级版（付费版）中，免费版的 WordPress.org 发

CVSS 7.2 · High EPSS 0.19% · P8

Affected Version Matrix 1

VendorProduct Version RangeStatus
WPEverest User Registration PRO – Custom Registration Form, Login Form, and User Profile WordPress Plugin ≤ 6.2.9 affected
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I. Basic Information for CVE-2026-87111

Vulnerability Information
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Vulnerability Title
User Registration PRO <= 6.2.9 - Unauthenticated Stored Cross-Site Scripting via HTTP Referer Header
Source: CVE Program / CVE List V5
Vulnerability Description
The User Registration PRO – Custom Registration Form, Login Form, and User Profile WordPress Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via HTTP Referer Header in all versions up to, and including, 6.2.9 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This vulnerability is present only in the premium build of the plugin and is not present in the free WordPress.org distribution. The nonce required to call the vulnerable AJAX endpoint is localized into the page source of every front-end page for anonymous visitors, making it fully obtainable by unauthenticated attackers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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
WPEverest User Registration PRO – Custom Registration Form, Login Form, and User Profile WordPress Plugin 0 ~ 6.2.9 -

II. Public POCs for CVE-2026-87111

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III. Intelligence Information for CVE-2026-87111

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Vendor Advisories for CVE-2026-87111 (1)

Vendor Pages for CVE-2026-87111 (1)

IV. Related Vulnerabilities

Same product: User Registration PRO – Custom Registration Form, Login Form, and User Profile WordPress Plugin
Same vendor: WPEverest
Same weakness: CWE-79

V. Comments for CVE-2026-87111

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