CVE-2021-39178

XSS in Image Optimization API for Next.js versions between 10.0.0 and 11.1.0

At a glance

Severity: HIGH 7.5
EPSS: EPSS 1.14 % · percentile 66 (2026-10-28)
State: PUBLISHED
Published: 2021-08-30
Updated: 2024-08-04
Assigner: GitHub_M
NVD status: Modified

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H	GitHub_M
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H	NVD · security-advisories@github.com (Secondary)
CVSS 3.1	MEDIUM 6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	NVD · nvd@nist.gov (Primary)
CVSS 2.0	MEDIUM 4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N	NVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

CWE-79

Advisories

GHSA-9gr3-7897-pp7m — XSS in Image Optimization API for Next.js

European references

ENISA EUVD · EUVD-2021-2024
GCVE · GCVE-0-2021-39178

Affected configurations (NVD CPE)

cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:* ≥ 10.0.0 < 11.1.1

Affected products

Product	Versions
vercel · next.js	affected >= 10.0.0, < 11.1.1

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD