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CVE-2021-39320— underConstruction <= 1.18 - Reflected Cross-Site Scripting

Quick assessment

Affected
Noah Kagan underConstruction
Exploitation
Public or AI PoC available; prioritize validation
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 插件是WordPress开源的一个应用插件。 WordPress插件存在安全漏洞，该漏洞源于在某些配置(包括Apache+modPHP)上，通过在请求路径中注入恶意代码，可以使用它执行反射跨站点脚本攻击。

CVSS 6.1 · Medium EPSS 2.32% · P82

Public Exploits 1

Nuclei · 1 CVE-2021-39320.yaml [template]
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I. Basic Information for CVE-2021-39320

Vulnerability Information
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Vulnerability Title
underConstruction <= 1.18 - Reflected Cross-Site Scripting
Source: CVE Program / CVE List V5
Vulnerability Description
The underConstruction plugin <= 1.18 for WordPress echoes out the raw value of `$GLOBALS['PHP_SELF']` in the ucOptions.php file. On certain configurations including Apache+modPHP, this makes it possible to use it to perform a reflected Cross-Site Scripting attack by injecting malicious code in the request path.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 插件跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress是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 插件是WordPress开源的一个应用插件。 WordPress插件存在安全漏洞，该漏洞源于在某些配置(包括Apache+modPHP)上，通过在请求路径中注入恶意代码，可以使用它执行反射跨站点脚本攻击。
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
Noah Kagan underConstruction 1.18 ~ 1.18 -

II. Public POCs for CVE-2021-39320

# POC Description Source Link Shenlong Link
1 WordPress Under Construction plugin before 1.19 contains a cross-site scripting vulnerability. The plugin echoes out the raw value of `$GLOBALS['PHP_SELF']` in the ucOptions.php file on certain configurations, including Apache+modPHP. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-39320.yaml POC Details
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III. Intelligence Information for CVE-2021-39320

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Vendor Advisories for CVE-2021-39320 (2)

IV. Related Vulnerabilities

Same product: underConstruction
Same vendor: Noah Kagan
Same weakness: CWE-79

V. Comments for CVE-2021-39320

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