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XSS in Image Optimization API for Next.js

High severity GitHub Reviewed Published Aug 30, 2021 in vercel/next.js • Updated Mar 31, 2023

Package

npm next (npm)

Affected versions

>= 10.0.0, < 11.1.1

Patched versions

11.1.1

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 array assigned
    • The image host assigned in images.domains allows user-provided SVG
  • Not affected: The next.config.js file has images.loader assigned to something other than default
  • Not affected: Deployments on Vercel are not affected

Patches

Next.js v11.1.1

References

@styfle styfle published to vercel/next.js Aug 30, 2021
Published by the National Vulnerability Database Aug 31, 2021
Reviewed Aug 31, 2021
Published to the GitHub Advisory Database Sep 1, 2021
Last updated Mar 31, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS score

0.066%
(30th percentile)

Weaknesses

CVE ID

CVE-2021-39178

GHSA ID

GHSA-9gr3-7897-pp7m

Source code

Credits

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