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TI-2021-12370 Aliases CVE-2021-32702GHSA-954c-jjx6-cxv7

Reflected XSS from the callback handler's error query parameter

Priority LOW 38CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. Versions before and including `1.4.1` are vulnerable to reflected XSS. An attacker can execute arbitrary code by providing an XSS payload in the `error` query parameter which is then processed by the callback handler as an error message. You are affected by this vulnerability if you are using `@auth0/nextjs-auth0` version `1.4.1` or lower **unless** you are using custom error handling that does not return the error message in an HTML response. Upgrade to version `1.4.1` to resolve. The fix adds basic HTML escaping to the error message and it should not impact your users.

Why it matters now

EPSS 0.01397 72nd percentileScored 2026-11-07
Fix Fixed nextjs-auth0 (auth0): 1.4.2@auth0/nextjs-auth0 (npm): 1.4.2

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
auth0nextjs-auth0before 1.4.21.4.2Patch availableCNA
—@auth0/nextjs-auth0 (npm)before 1.4.21.4.2Patch availableGHSA-954c-jjx6-cxv7
  • nextjs-auth0 Vendorauth0 Affected before 1.4.2 Fixed in 1.4.2 Patch available CNA
  • @auth0/nextjs-auth0 (npm) Vendor— Affected before 1.4.2 Fixed in 1.4.2 Patch available GHSA-954c-jjx6-cxv7

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:auth0:nextjs-auth0:*:*:*:*:*:node.js:*:*before 1.4.2Vulnerableauth0
  • cpe:2.3:a:auth0:nextjs-auth0:*:*:*:*:*:node.js:*:* Versions before 1.4.2 Vulnerable ·auth0

Remediation

  • Fix · CNA nextjs-auth0 (auth0) Fixed in 1.4.2
  • Fix · GHSA-954c-jjx6-cxv7 @auth0/nextjs-auth0 (npm) Fixed in 1.4.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-32702
  2. 2026-10-03 Alias added: GHSA-954c-jjx6-cxv7

References

Patch 1

Advisory 2

Other 2

  • TI-2021-19618 Open redirect in nextjs-auth0 CVSS 3.1MEDIUM 6.4
  • TI-2025-41412 Auth0 Next.js SDK has Improper Validation of Query Parameters CVSS 3.1MEDIUM 5.7
  • TI-2026-28970 Auth0 Next.js SDK has Improper Proxy Cache Lookup CVSS 3.1MEDIUM 5.4
  • TI-2025-41249 Auth0 Next.js SDK has Improper Request Caching Lookup CVSS 3.1MEDIUM 5.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences