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CVE-2021-39178— XSS in Image Optimization API for Next.js versions between 10.0.0 and 11.1.0

Quick assessment

Affected
vercel next.js
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.

ZEIT Next.js是ZEIT公司的一款基于Vue.js、Node.js、Webpack和Babel.js的开源Web应用框架。 Next.js 10.0.0至11.0.0版本存在跨站脚本漏洞，攻击者可以利用该漏洞执行任意js命令。

CVSS 7.5 · High EPSS 1.14% · P64
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I. Basic Information for CVE-2021-39178

Vulnerability Information
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Vulnerability Title
XSS in Image Optimization API for Next.js versions between 10.0.0 and 11.1.0
Source: CVE Program / CVE List V5
Vulnerability Description
Next.js is a React framework. Versions of Next.js between 10.0.0 and 11.0.0 contain a cross-site scripting vulnerability. In order for an instance to be affected by the vulnerability, the `next.config.js` file must have `images.domains` array assigned and the image host assigned in `images.domains` must allow user-provided SVG. If the `next.config.js` file has `images.loader` assigned to something other than default or the instance is deployed on Vercel, the instance is not affected by the vulnerability. The vulnerability is patched in Next.js version 11.1.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
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
ZEIT Next.js 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ZEIT Next.js是ZEIT公司的一款基于Vue.js、Node.js、Webpack和Babel.js的开源Web应用框架。 Next.js 10.0.0至11.0.0版本存在跨站脚本漏洞，攻击者可以利用该漏洞执行任意js命令。
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
vercel next.js >= 10.0.0, < 11.1.1 -

II. Public POCs for CVE-2021-39178

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III. Intelligence Information for CVE-2021-39178

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Vendor Advisories for CVE-2021-39178 (1)

Other References for CVE-2021-39178 (1)

IV. Related Vulnerabilities

Same product: next.js
Same vendor: vercel
Same weakness: CWE-79

V. Comments for CVE-2021-39178

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