Skip to content

CVE-2023-48309 | next-auth

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..This CVE has a CVSS3.1 score of 5.3 and a Base Severity of MEDIUM.

InfoDetails
CVE IDCVE-2023-48309
CVE StatePUBLISHED
BaseScore5.3
BaseSeverityMEDIUM
VectorStringCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
VersionNA

References for CVE-2023-48309 :
https://github.com/nextauthjs/next-auth/security/advisories/GHSA-v64w-49xw-qq89
https://github.com/nextauthjs/next-auth/commit/d237059b6d0cb868c041ba18b698e0cee20a2f10
https://authjs.dev/guides/basics/role-based-access-control
https://next-auth.js.org/configuration/nextjs#advanced-usage
https://next-auth.js.org/configuration/nextjs#middlewar

Metric TypeMetric Score
AttackVector(AV)NETWORK
AttackComplexity(AC)LOW
PrivilegesRequired(PR)NONE
UserInteraction(UI)NONE
Scope(S)UNCHANGED
Confidentiality(C)LOW
Availability(A)NONE
Integrity(I)NONE