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fix(auth): scope OAuth session cookie via secure + AUTH_COOKIE_PREFIX #377

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ben-fornefeld merged 2 commits into from
Jun 9, 2026
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fix(auth): scope OAuth session cookie via secure + AUTH_COOKIE_PREFIX #377

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fix(auth): scope OAuth session cookie via secure + AUTH_COOKIE_PREFIX
tvi Jun 9, 2026
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style: apply biome formatting
tvi Jun 9, 2026
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23 changes: 23 additions & 0 deletions src/auth.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -8,11 +8,34 @@ import {

const oryOAuth2Audience = process.env.ORY_OAUTH2_AUDIENCE

const useSecureCookies = process.env.VERCEL_ENV === 'production'
// Standard Auth.js secure-cookie convention.
const securePrefix = useSecureCookies ? '__Secure-' : ''
// Cookies are scoped by host+path+name, NOT by port. Running two local
// dashboards on different localhost ports makes them share the default
// session cookie and clobber each other. AUTH_COOKIE_PREFIX lets each
// instance use a distinct cookie name. Unset in prod/preview.
const cookiePrefix = process.env.AUTH_COOKIE_PREFIX
? `${process.env.AUTH_COOKIE_PREFIX}.`
: ''

export const { handlers, auth, signIn, signOut } = NextAuth({
// isolates from existing /api/auth/{callback,email-callback,verify-otp}
basePath: '/api/auth/oauth',
secret: process.env.AUTH_SECRET,
session: { strategy: 'jwt' },
useSecureCookies,
cookies: {
sessionToken: {
name: `${securePrefix}${cookiePrefix}authjs.session-token`,
options: {
httpOnly: true,
sameSite: 'lax',
path: '/',
secure: useSecureCookies,
},
},
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},
// route handler that logs the failure and redirects to /sign-in so users
// never see Auth.js's built-in error page; see oauth-recover/route.ts.
pages: {
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