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CVE-2021-39178

HIGH
Published 2021-08-30T23:55:09
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CVSS Score

V3.1
7.5
/10
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.007
probability
of exploitation in the wild

There is a 0.7% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.710
Higher than 71.0% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED

Impact Metrics

Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

vercel

next.js

Affected Versions:

>= 10.0.0, < 11.1.1

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed HIGH

XSS in Image Optimization API for Next.js

GHSA-9gr3-7897-pp7m

Advisory Details

### Impact - **Affected:** All of the following must be true to be affected - Next.js between version 10.0.0 and 11.1.0 - The `next.config.js` file has [`images.domains`](https://nextjs.org/docs/basic-features/image-optimization#domains) array assigned - The image host assigned in [`images.domains`](https://nextjs.org/docs/basic-features/image-optimization#domains) allows user-provided SVG - **Not affected**: The `next.config.js` file has [`images.loader`](https://nextjs.org/docs/basic-features/image-optimization#loader) assigned to something other than default - **Not affected**: Deployments on [Vercel](https://vercel.com) are not affected ### Patches [Next.js v11.1.1](https://github.com/vercel/next.js/releases/tag/v11.1.1)

Affected Packages

npm next
ECOSYSTEM: ≥10.0.0 <11.1.1

CVSS Scoring

CVSS Score

7.5

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References

WEB https://github.com/vercel/next.js/security/advisories/GHSA-9gr3-7897-pp7m
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-39178
WEB https://github.com/vercel/next.js/pull/28620
WEB https://github.com/vercel/next.js/commit/7afc97c5744b38bdf36aa7f87625f438224688aa
PACKAGE https://github.com/vercel/next.js
WEB https://github.com/vercel/next.js/releases/tag/v11.1.1

Advisory provided by GitHub Security Advisory Database. Published: September 1, 2021, Modified: August 31, 2021

References

https://github.com/vercel/next.js/security/advisories/GHSA-9gr3-7897-pp7m
https://github.com/vercel/next.js/releases/tag/v11.1.1
Published: 2021-08-30T23:55:09
Last Modified: 2024-08-04T01:58:18.141Z
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