CVE-2026-107369

Improper Validation of Post-Login Redirect URL in nextjs-auth0

Published Oct 13, 2026 CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Description
The auth0/nextjs-auth0 SDK validates that the returnTo parameter is a same-origin URL. The SDK then stores this value and, in a later step, reconstructs it for the post-authentication redirect. The reconstruction logic can produce a URL that browsers interpret as an absolute or scheme-relative path, leading to a redirect to an unintended domain.

Remediation

Vendor Solution

Upgrade auth0/nextjs-auth0 to version 4.32.0 or greater.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Auth0
Auth0 nextjs-auth0
Vendors & Products Auth0
Auth0 nextjs-auth0
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description The auth0/nextjs-auth0 SDK validates that the returnTo parameter is a same-origin URL. The SDK then stores this value and, in a later step, reconstructs it for the post-authentication redirect. The reconstruction logic can produce a URL that browsers interpret as an absolute or scheme-relative path, leading to a redirect to an unintended domain.
Title Improper Validation of Post-Login Redirect URL in nextjs-auth0
Weaknesses CWE-601
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Okta
Published
Updated
Oct 14, 2026, 6:41 PM
Reserved
Oct 7, 2026, 8:59 PM
Status
Awaiting Analysis
Published
Oct 13, 2026, 9:17 PM
Modified
Oct 15, 2026, 8:38 PM