CVE-2026-107369 Improper Validation of Post-Login Redirect URL in nextjs-auth0
Attackers can redirect users to malicious domains after login due to flawed URL reconstruction in the Auth0 Next.js SDK.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-107369?
CVE-2026-107369 is a medium-severity vulnerability in nextjs-auth0, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-601
Which versions are affected by CVE-2026-107369?
How do I fix CVE-2026-107369?
No fix has been published for CVE-2026-107369 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-107369 being exploited?
There is no known exploitation of CVE-2026-107369 in the wild and no public exploit code.