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Graph/samesite-blocks-auth-cookie

Pattern

SameSite Cookie Auth Breaks

samesite-blocks-auth-cookie

Session or remember-me auth cookies fail to reach the backend because SameSite defaults like Lax block third-party/redirect flows and server-component cookie APIs throw, so the client cannot attach JWT/refresh tokens automatically and authentication silently breaks.

Node Details

Public graph metadata

Updated6/23/2026

Connections

30 linked nodes

Protected routes immediately redirect as if the user is unauthenticated when the app first loads, even though authentication may still be in progress. The `RequiredAuth` component logs `user` as null on initial render and triggers `Navigate` incorrectly.

Axios requests need to work on both client and server in Next.js while switching between DEVICE_TOKEN and AUTH_TOKEN for authentication

Cookie “__vercel_live_token” has been rejected because it is in a cross-site context and its “SameSite” is “Lax” or “Strict” — deployed it on Vercel. Tension: But i setup cookies in my project like this. Outcome: Then you need to use https://localhost:5000 and not http://localhost:5000.

When the UI calls the `POST /auth/callback/passkey` endpoint. Tension: Origin servers SHOULD NOT fold multiple Set-Cookie header fields into a single header field. Outcome: Cloudflare seem to be in the wrong here.

when I refresh my page the cookie gets deleted — I have deployed my sveltekit frontend and python flask backend on vercel. Tension: On localhost, they worked just fine however when I deployed it, the cookies were not persistent. Outcome: it does sets the cookie, but on refresh, the cookie gets disappeared.

Errors from an ASP.NET Core 7 app are not appearing in Sentry, and the console shows `CSRF Verification Failed A required security token was not found or was invalid`.

RedirectResponse goes to "/" without the authentication cookie

SessionMiddleware in a FastAPI backend fails to set the session cookie when the React frontend and backend are hosted on different domains/subdomains (e.g., XXX-ui.fly.dev vs XXX-api.fly.dev). The browser rejects the cookie with an 'invalid domain' error and no session is maintained.

were not accessible in js and in browser — Cookies are being set and sent with the next request. Outcome: The problem solved by adding `domain="blueberry.adefe.xyz"` to the cookie in response.

FastAPI returns 401 with JWK public Attribute for authorization token not found

MissingKeyMissing Key-Pair-Id query parameter or cookie value — {urn}/manifest/{derivativeurn}/signedcookies. Tension: I get the following error that suggest I'm missing a header.

Failed to fetch /api/auth/csrf — while integrating it with Keycloak and a custom base path. Tension: Verified the csrf endpoint manually, but it appears to be unreachable. Outcome: I solved it by manually signout.

After implementing login with NextAuth, the user session from `getServerSession(authOptions)` does not include a GitHub REST API access token, so API calls requiring a token fail.

`signIn('credentials', ...)` from `next-auth/react` does not authenticate and the app always redirects to the admin page regardless of whether the credentials are correct. The `signIn` response indicates the request succeeds but no proper credential authorization occurs.

the user is not properly logged out by the program, even after I click logout — on the `"Auth Required"` menu (`Auth.razor`). Tension: the expected logout behavior is only applied to the following pages. Outcome: This should resolve the loophole upon logout and user back navigation using the Blazor Identity options.

Embedding a CPQ web app as an iframe inside Salesforce fails to persist authentication cookies/session for API calls. Login in a new tab isn’t recognized inside the Salesforce iframe, preventing authorized requests.

Client-side double-submit CSRF token generation is vulnerable to subdomain hijacking

Confusion about cookie authentication versus token authentication

it is also required to "forget" the token right after exiting/closing the app — I have a web API which uses JWT tokens for accessing resources. Tension: The issue with (1) is that it's not cleared when a browser's tab is closed but only when all the windows are. And (2) is not secure since if an attacker manages to inject a code into a client he will be able to extract the access token.

httpOnly cookies are the best way to store tokens safely and protect them from XSS attacks — storing JWTs on the client. Tension: JavaScript won't be allowed to read httpOnly cookies. How would the client handle routes authentication? Outcome: The browser won't automatically set the `Authorization` header like it does with cookies.

if(!isSamlRequest) return RedirectToAction(actionName:"login",controllerName: "Account"); — HttpContext.Request.Query.ContainsKey("SAMLRequest") || HttpContext.Request.Headers.ContainsKey("SAMLRequest"). Outcome: return LoginResponse(saml2AuthnRequest.Id, Saml2StatusCodes.Success, requestBinding.RelayState, relyingParty, sessionIndex, claims);.

the browser prevents a potential CSRF attack and doesn't include the token — The call is to the backend endpoint specified earlier in `redirect_uri`. Tension: I need a browser to include the `ASP.NET_SessionId` cookie in the request. Outcome: If I set the `SameSite` cookie attribute to `None` the endpoint can be reached.

If I check 'Remember Me' in form, this add a cookie with name "REMEMBERME". Tension: I'm implementing custom authenticator. Outcome: your cookie is normal.

The session identifier (req.sessionID) changed on every subsequent HTTP request from the React client to the Express server, preventing consistent session persistence.

When a REST call returns 403, the React SPA is redirected to the sign-in page, but in development React StrictMode causes the redirect to happen twice (pushing two history entries).

Clicking the SSO button does not redirect the user to the /home page after authentication, and MSAL token generation does not occur. The app stays on the same page without completing the login flow.

After signing in, middleware redirection occurs, but the browser URL remains unchanged (e.g., it doesn't update to the intended callback/protected route).

The browser does not store the refresh token cookie returned by the Django Ninja login endpoint, even though the cookie appears in the response headers and the fetch call uses credentials: 'include'.

one is working without any credential or cookie[SessionId] but another one is not working — two api's in my spring mvc project which have identical structure. Tension: while calling using Postman or while hitting the APIs in browser/UI project.

throws "Cookies can only be modified in a Server Action or Route Handler" — called from Next.js 15 Server Components (pages, layouts). Tension: The error appears intermittently — only when the session needs refreshing (controlled by `updateAge` config). Outcome: With `updateAge: 300` (5 minutes), it crashes every ~5 minutes for active users.

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