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CVE-2020-4070— Cross-site Scripting in CSS Validator

Quick assessment

Affected
World Wide Web Consortium (W3C) CSS Validator
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.

CSS Validator是万维网（W3C）联盟的一款CSS（层叠样式表）验证程序。 CSS Validator 54d68a1及之前版本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。

CVSS 4.6 · Medium EPSS 0.55% · P44
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I. Basic Information for CVE-2020-4070

Vulnerability Information
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Vulnerability Title
Cross-site Scripting in CSS Validator
Source: CVE Program / CVE List V5
Vulnerability Description
In CSS Validator less than or equal to commit 54d68a1, there is a cross-site scripting vulnerability in handling URIs. A user would have to click on a specifically crafted validator link to trigger it. This has been patched in commit e5c09a9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/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
CSS Validator 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CSS Validator是万维网（W3C）联盟的一款CSS（层叠样式表）验证程序。 CSS Validator 54d68a1及之前版本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。
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
World Wide Web Consortium (W3C) CSS Validator <= 54d68a1 -

II. Public POCs for CVE-2020-4070

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III. Intelligence Information for CVE-2020-4070

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Patches & Fixes for CVE-2020-4070 (1)

Vendor Advisories for CVE-2020-4070 (1)

IV. Related Vulnerabilities

Same product: CSS Validator
Same weakness: CWE-79

V. Comments for CVE-2020-4070

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