CVE-2026-107369 Auth0 CVE debrief

Who should care

Auth0 nextjs-auth0 users and administrators should assess exposure and prioritize verification due to potential redirects to unintended domains. This issue requires review of compensating controls for exposed systems while remediation is scheduled and verified. Operators, platforms, and security teams impacted by this vulnerability must plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Why it matters

CVE-2026-107369 Improper Validation of Post-Login Redirect URL in nextjs-auth0 may allow potential redirects to unintended domains. Auth0 nextjs-auth0 users and administrators should assess exposure and prioritize verification.

• Potential redirects to unintended domains may require verification.
• Users and administrators may need to update nextjs-auth0 to version 4.32.0 or later.

Technical summary

The auth0/nextjs-auth0 SDK validates that the returnTo parameter is a same-origin URL, but 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. This issue impacts Auth0 nextjs-auth0 users and administrators who must assess exposure and prioritize verification. The vulnerability allows potential redirects to unintended domains, requiring verification and potential updates to nextjs-auth0 to version 4.32.0 or later. Affected operators, platforms, and security teams should review compensating controls and monitor for potential redirects.

Defensive priority

Assess exposure and prioritize verification for Auth0 nextjs-auth0 users.

Recommended defensive actions

• Review and update nextjs-auth0 to version 4.32.0 or later.
• Assess exposure and prioritize verification for Auth0 nextjs-auth0 users.
• Monitor for potential redirects to unintended domains.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The auth0/nextjs-auth0 SDK improperly validates the returnTo parameter, allowing for redirects to unintended domains. Evidence is limited to public CVE metadata and source item descriptions. Defenders should verify affected scope, severity, and vendor guidance through official advisories or CVE records. 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. This issue requires review of compensating controls for exposed systems while rem

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.