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CVE-2020-4049— Authenticated self-XSS via theme uploads in WordPress

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中存在跨站脚本漏洞。该漏洞源于WEB应用缺少对客户端数据的正确验证。攻击者可利用该漏洞执行客户端代码。以下产品及版本受到影响：WordPress 5.3.4版本，5.2.7版本，5.1.6版本，5.0.10版本，4.9.15版本，4.8.14版本，4.7.18， 4.6.19版本，4.5.22版本，4.4.23版本，4.3.24版本，4.2.28版本

CVSS 2.4 · Low EPSS 2.53% · P84
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I. Basic Information for CVE-2020-4049

Vulnerability Information
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Vulnerability Title
Authenticated self-XSS via theme uploads in WordPress
Source: CVE Program / CVE List V5
Vulnerability Description
In affected versions of WordPress, when uploading themes, the name of the theme folder can be crafted in a way that could lead to JavaScript execution in /wp-admin on the themes page. This does require an admin to upload the theme, and is low severity self-XSS. This has been patched in version 5.4.2, along with all the previously affected versions via a minor release (5.3.4, 5.2.7, 5.1.6, 5.0.10, 4.9.15, 4.8.14, 4.7.18, 4.6.19, 4.5.22, 4.4.23, 4.3.24, 4.2.28, 4.1.31, 4.0.31, 3.9.32, 3.8.34, 3.7.34).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
Web页面中脚本相关HTML标签转义处理不恰当(基本跨站脚本)
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中存在跨站脚本漏洞。该漏洞源于WEB应用缺少对客户端数据的正确验证。攻击者可利用该漏洞执行客户端代码。以下产品及版本受到影响：WordPress 5.3.4版本，5.2.7版本，5.1.6版本，5.0.10版本，4.9.15版本，4.8.14版本，4.7.18， 4.6.19版本，4.5.22版本，4.4.23版本，4.3.24版本，4.2.28版本
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
WordPress wordpress-develop >= 5.4.0, < 5.4.2 -

II. Public POCs for CVE-2020-4049

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III. Intelligence Information for CVE-2020-4049

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Patches & Fixes for CVE-2020-4049 (1)

Vendor Advisories for CVE-2020-4049 (2)

Mailing List Discussions for CVE-2020-4049 (4)

Other References for CVE-2020-4049 (1)

Same Patch Batch · WordPress · 2020-06-12 · 5 CVEs total

CVE-2020-4047 6.8 MEDIUM Authenticated XSS via media attachment page in WordPress
CVE-2020-4048 5.7 MEDIUM Open redirect in wp_validate_redirect() in WordPress
CVE-2020-4046 5.4 MEDIUM Authenticated XSS through embed block in WordPress
CVE-2020-4050 3.5 LOW set-screen-option filter misuse by plugins leading to privilege escalation in WordPress

IV. Related Vulnerabilities

Same product: wordpress-develop
Same vendor: WordPress
Same weakness: CWE-80

V. Comments for CVE-2020-4049

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