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CVE-2021-39357— Leaky Paywall <= 4.16.5 Authenticated Stored Cross-Site Scripting

Quick assessment

Affected
Leaky Paywall Leaky Paywall
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是WordPress（Wordpress）基金会的一套使用PHP语言开发的博客平台。该平台支持在PHP和MySQL的服务器上架设个人博客网站。 WordPress 插件 Leaky Paywall 在 4.16.5 及以下版本中存在跨站脚本漏洞，该漏洞源于通过 ~/class.php 文件进行的输入验证和清理不充分。该漏洞允许具有管理用户访问权限的攻击者注入任意 Web 脚本。

CVSS 5.5 · Medium EPSS 0.92% · P57
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I. Basic Information for CVE-2021-39357

Vulnerability Information
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Vulnerability Title
Leaky Paywall <= 4.16.5 Authenticated Stored Cross-Site Scripting
Source: CVE Program / CVE List V5
Vulnerability Description
The Leaky Paywall WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and sanitization via the ~/class.php file which allowed attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 4.16.5. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/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
Vulnerability Title
WordPress 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress是WordPress（Wordpress）基金会的一套使用PHP语言开发的博客平台。该平台支持在PHP和MySQL的服务器上架设个人博客网站。 WordPress 插件 Leaky Paywall 在 4.16.5 及以下版本中存在跨站脚本漏洞，该漏洞源于通过 ~/class.php 文件进行的输入验证和清理不充分。该漏洞允许具有管理用户访问权限的攻击者注入任意 Web 脚本。
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
Leaky Paywall Leaky Paywall 4.16.5 ~ 4.16.5 -

II. Public POCs for CVE-2021-39357

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III. Intelligence Information for CVE-2021-39357

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Patches & Fixes for CVE-2021-39357 (1)

Other References for CVE-2021-39357 (2)

IV. Related Vulnerabilities

Same product: Leaky Paywall
Same vendor: Leaky Paywall
Same weakness: CWE-79

V. Comments for CVE-2021-39357

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