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CVE-2021-39201— Authenticated cross-site scripting (XSS) in WordPress editor

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之前版本存在跨站脚本漏洞，该漏洞允许经过身份验证但权限较低的用户在编辑器中执行XSS。

CVSS 7.6 · High EPSS 1.49% · P73
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I. Basic Information for CVE-2021-39201

Vulnerability Information
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Vulnerability Title
Authenticated cross-site scripting (XSS) in WordPress editor
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. ### Impact The issue allows an authenticated but low-privileged user (like contributor/author) to execute XSS in the editor. This bypasses the restrictions imposed on users who do not have the permission to post `unfiltered_html`. ### Patches This has been patched in WordPress 5.8, and will be pushed to older versions via minor releases (automatic updates). It's strongly recommended that you keep auto-updates enabled to receive the fix. ### References https://wordpress.org/news/category/releases/ https://hackerone.com/reports/1142140 ### For more information If you have any questions or comments about this advisory: * Open an issue in [HackerOne](https://hackerone.com/wordpress)
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 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之前版本存在跨站脚本漏洞，该漏洞允许经过身份验证但权限较低的用户在编辑器中执行XSS。
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 >= 5.0, < 5.8.0 -

II. Public POCs for CVE-2021-39201

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III. Intelligence Information for CVE-2021-39201

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Vendor Advisories for CVE-2021-39201 (2)

Other References for CVE-2021-39201 (1)

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

CVE-2021-39202 7.6 HIGH WordPress 5.8 beta: Stored Cross-Site Scripting (XSS) vulnerability in widget
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-2021-39201

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