Vulnerability Description
NextAuth.js provides authentication for Next.js. `next-auth` applications prior to version 4.24.5 that rely on the default Middleware authorization are affected by a vulnerability. A bad actor could create an empty/mock user, by getting hold of a NextAuth.js-issued JWT from an interrupted OAuth sign-in flow (state, PKCE or nonce). Manually overriding the `next-auth.session-token` cookie value with this non-related JWT would let the user simulate a logged in user, albeit having no user information associated with it. (The only property on this user is an opaque randomly generated string). This vulnerability does not give access to other users' data, neither to resources that require proper authorization via scopes or other means. The created mock user has no information associated with it (ie. no name, email, access_token, etc.) This vulnerability can be exploited by bad actors to peek at logged in user states (e.g. dashboard layout). `next-auth` `v4.24.5` contains a patch for the vulnerability. As a workaround, using a custom authorization callback for Middleware, developers can manually do a basic authentication.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nextauth.Js | Next-Auth | < 4.24.5 |
Related Weaknesses (CWE)
References
- https://authjs.dev/guides/basics/role-based-access-controlTechnical Description
- https://github.com/nextauthjs/next-auth/commit/d237059b6d0cb868c041ba18b698e0ceePatch
- https://github.com/nextauthjs/next-auth/security/advisories/GHSA-v64w-49xw-qq89Vendor Advisory
- https://next-auth.js.org/configuration/nextjs#advanced-usageTechnical Description
- https://next-auth.js.org/configuration/nextjs#middlewarTechnical Description
- https://authjs.dev/guides/basics/role-based-access-controlTechnical Description
- https://github.com/nextauthjs/next-auth/commit/d237059b6d0cb868c041ba18b698e0ceePatch
- https://github.com/nextauthjs/next-auth/security/advisories/GHSA-v64w-49xw-qq89Vendor Advisory
- https://next-auth.js.org/configuration/nextjs#advanced-usageTechnical Description
- https://next-auth.js.org/configuration/nextjs#middlewarTechnical Description
FAQ
What is CVE-2023-48309?
CVE-2023-48309 is a vulnerability with a CVSS score of 5.3 (MEDIUM). NextAuth.js provides authentication for Next.js. `next-auth` applications prior to version 4.24.5 that rely on the default Middleware authorization are affected by a vulnerability. A bad actor could c...
How severe is CVE-2023-48309?
CVE-2023-48309 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-48309?
Check the references section above for vendor advisories and patch information. Affected products include: Nextauth.Js Next-Auth.