What is CVE-2021-39178?

CVE-2021-39178 is a cross-site scripting vulnerability in Next.js versions between 10.0.0 and 11.0.0.

How severe is CVE-2021-39178?

CVE-2021-39178 has a severity rating of 6.1, which is considered high.

How does CVE-2021-39178 impact Next.js?

CVE-2021-39178 can allow attackers to perform cross-site scripting attacks on instances of Next.js.

How can I fix CVE-2021-39178?

To fix CVE-2021-39178, you should upgrade Next.js to version 11.1.1 or higher, which includes a fix for the vulnerability.

Where can I find more information about CVE-2021-39178?

You can find more information about CVE-2021-39178 on the Next.js GitHub page and the associated security advisory.

Vulnerability/
CVE-2021-39178

high

7.5

CWE

30/8/2021

4/8/2024

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

First published: Mon Aug 30 2021(Updated: )

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.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Vercel Next.js	>=10.0.0<11.1.1

Remedy

https://github.com/vercel/next.js/releases/tag/v11.1.1

Remedy

https://github.com/vercel/next.js/security/advisories/GHSA-9gr3-7897-pp7m

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Frequently Asked Questions

What is CVE-2021-39178?
CVE-2021-39178 is a cross-site scripting vulnerability in Next.js versions between 10.0.0 and 11.0.0.
How severe is CVE-2021-39178?
CVE-2021-39178 has a severity rating of 6.1, which is considered high.
How does CVE-2021-39178 impact Next.js?
CVE-2021-39178 can allow attackers to perform cross-site scripting attacks on instances of Next.js.
How can I fix CVE-2021-39178?
To fix CVE-2021-39178, you should upgrade Next.js to version 11.1.1 or higher, which includes a fix for the vulnerability.
Where can I find more information about CVE-2021-39178?
You can find more information about CVE-2021-39178 on the Next.js GitHub page and the associated security advisory.

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