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CVE-2021-39202— WordPress 5.8 beta: Stored Cross-Site Scripting (XSS) vulnerability in widget

Quick assessment

Affected
WordPress wordpress-develop
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 5.8 beta 1 版本存在跨站脚本漏洞，该漏洞源于在软件引入的小部件编辑器在自定义HTML特性中对HTML输入处理不当。这将导致在自定义HTML小部件中的存储型跨站脚本漏洞。

CVSS 7.6 · High EPSS 0.82% · P56
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I. Basic Information for CVE-2021-39202

Vulnerability Information
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Vulnerability Title
WordPress 5.8 beta: Stored Cross-Site Scripting (XSS) vulnerability in widget
Source: CVE Program / CVE List V5
Vulnerability Description
WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. In affected versions the widgets editor introduced in WordPress 5.8 beta 1 has improper handling of HTML input in the Custom HTML feature. This leads to stored XSS in the custom HTML widget. This has been patched in WordPress 5.8. It was only present during the testing/beta phase of WordPress 5.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/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（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 5.8 beta 1 版本存在跨站脚本漏洞，该漏洞源于在软件引入的小部件编辑器在自定义HTML特性中对HTML输入处理不当。这将导致在自定义HTML小部件中的存储型跨站脚本漏洞。
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
WordPress wordpress-develop 5.8 beta 1 -

II. Public POCs for CVE-2021-39202

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III. Intelligence Information for CVE-2021-39202

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Vendor Advisories for CVE-2021-39202 (1)

Other References for CVE-2021-39202 (1)

Same Patch Batch · WordPress · 2021-09-09 · 4 CVEs total

CVE-2021-39201 7.6 HIGH Authenticated cross-site scripting (XSS) in WordPress editor
CVE-2021-39203 6.8 MEDIUM Private data disclosure/privilege escalation through the block editor in Wordpress
CVE-2021-39200 5.3 MEDIUM Information Disclosure in wp_die() via JSONP in wordpress

IV. Related Vulnerabilities

Same product: wordpress-develop
Same vendor: WordPress
Same weakness: CWE-79

V. Comments for CVE-2021-39202

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