CVE-2021-39178
XSS in Image Optimization API for Next.js
Description
### 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)
How to fix CVE-2021-39178
To remediate CVE-2021-39178, upgrade the affected package to a fixed version below.
- —upgrade to 11.1.1 or later
Is CVE-2021-39178 being exploited?
Low — EPSS is 0.7%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 10.0.0, < 11.1.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |