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TI-2026-28970 Aliases CVE-2026-40155GHSA-xq8m-7c5p-c2r6

Auth0 Next.js SDK has Improper Proxy Cache Lookup

Priority LOW 24CWE-362Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.

Summary

The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. In versions 4.12.0 through 4.17.1, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results. Users are affected if their project uses both the vulnerable versions and the proxy handler /me/* and /my-org/* with DPoP enabled. This issue has been fixed in version 4.18.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00214 11th percentileScored 2026-11-07
Fix Fixed nextjs-auth0 (auth0): 4.18.0@auth0/nextjs-auth0 (npm): 4.18.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
auth0nextjs-auth04.12.0 to before 4.18.04.18.0Patch availableCNA
—@auth0/nextjs-auth0 (npm)4.12.0 to before 4.18.04.18.0Patch availableGHSA-xq8m-7c5p-c2r6
  • nextjs-auth0 Vendorauth0 Affected 4.12.0 to before 4.18.0 Fixed in 4.18.0 Patch available CNA
  • @auth0/nextjs-auth0 (npm) Vendor— Affected 4.12.0 to before 4.18.0 Fixed in 4.18.0 Patch available GHSA-xq8m-7c5p-c2r6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:auth0:nextjs-auth0:*:*:*:*:*:node.js:*:*4.12.0 to before 4.18.0Vulnerableauth0
  • cpe:2.3:a:auth0:nextjs-auth0:*:*:*:*:*:node.js:*:* Versions 4.12.0 to before 4.18.0 Vulnerable ·auth0

Remediation

  • Fix · CNA nextjs-auth0 (auth0) Fixed in 4.18.0
  • Fix · GHSA-xq8m-7c5p-c2r6 @auth0/nextjs-auth0 (npm) Fixed in 4.18.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40155
  2. 2026-10-03 Alias added: GHSA-xq8m-7c5p-c2r6

References

Patch 1

Advisory 2

Other 2

  • TI-2021-12370 Reflected XSS from the callback handler's error query parameter CVSS 3.1HIGH 8.0
  • 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-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