Unresolved Default SameSite Policy in Flask Sessions
When upgrading from Flask 2.x to 3.x, the framework changes the default SAME_SITE attribute for session cookies from None to Lax . This adjustment improves CSRF protection but can unintentionally block legitimate cross‑site authentication flows that previously relied on SameSite=None . Because Flask ships with client‑side sessions by default, the entire sess
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