Callback handler failed. CAUSE: Missing state cookie from login request (check login URL, callback URL and cookie config)

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
typescript
Domain
api, authentication

Research direction

Start with pages/api/auth/[...auth0], then read the callback flow in src/handlers/callback.ts and src/auth0-session/handlers/callback.ts. Trace how missing state cookies, expired cookies, and access_denied are surfaced. Done means both causes are handled gracefully, with missing-cookie users receiving a meaningful error and access-denied users redirected to the login page with a message.

Written by the indexing model from the issue text.

Description

What

Multiple CallbackHandlerError variants in the Auth0 callback handler at pages/api/auth/[...auth0] are not handled gracefully, causing noisy error reports.

Variant 1: Missing state cookie

Probably some users are trying to authenticate with disabled cookies. We need to check this before authentication and show an error, also need to check whether we show proper error if this cookie is expired.

CallbackHandlerError: Callback handler failed. CAUSE: Missing state cookie from login request (check login URL, callback URL and cookie config). (code: ERR_CALLBACK_HANDLER_FAILURE)
    at <anonymous> (src/handlers/callback.ts:375:13)
    ...
Caused by:
  Error: Missing state cookie from login request (check login URL, callback URL and cookie config).
      at <anonymous> (src/auth0-session/handlers/callback.ts:45:13)
Variant 2: Access denied (from #2690)

User denied application access during OAuth flow.

CallbackHandlerError: Callback handler failed. CAUSE: access_denied (The user has denied your application access.) (code: ERR_CALLBACK_HANDLER_FAILURE)
    at <anonymous> (.next/server/chunks/7951.js:1:40109)
    ...
Caused by:
  Error: access_denied (The user has denied your application access.)

Proposed Fix

  • Detect specific CallbackHandlerError causes (access_denied, Missing state cookie) and handle gracefully
  • Redirect users to an appropriate error page instead of letting these bubble up as unhandled errors
  • For Missing state cookie: check cookie support before initiating auth, show meaningful error
  • For access_denied: redirect to login page with a message

Consolidates: #2690

Dominant language
TypeScript
Stars
264
Forks
94
Avg merge
18h 49m
Merged PRs (30d)
297

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