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CHIPS Partitioned cookie missing SameSite=None or Secure

A cross-site login flow relies on cookies that are not marked correctly for modern browser partitioning rules.

Error text / 报错原文

  • Partitioned cookie missing SameSite=None
  • CHIPS cookie not set
  • third party cookie blocked login

What it means

A cross-site login flow relies on cookies that are not marked correctly for modern browser partitioning rules.

Most common causes

  • Missing Secure
  • Missing SameSite=None
  • Partitioned without correct context
  • Legacy third-party cookie assumption

Fastest fix

  • Reproduce the smallest failing case.
  • Check environment, platform, and production settings.
  • Use the related local tool to classify the issue.
  • Fix the highest-risk security or data issue first.

Safe fix

  • Keep secrets out of client code and logs.
  • Prefer least privilege and explicit allowlists.
  • Add a regression test or checklist before retrying.
  • Document the working production configuration.

What not to do

  • Do not disable security controls as a permanent fix.
  • Do not paste secrets into public issue trackers or AI chats.
  • Do not trust preview success as production readiness.

Diagnostic commands

window.PublicKeyCredential
location.origin
document.querySelector("input[autocomplete*=webauthn]")

Related tools

Related errors

Sources