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Security L6 SECURITY-1292 · 15 min

A SameSite fix solves desktop login and still breaks mobile webview SSO because the embedded browser handles cross-site cookie returns differently

Normal browsers pass, yet mobile webviews keep looping because they apply tighter or different cookie return rules.

SecurityPlatform ReliabilityLevel 6Pro15 min
Scenario

An auth hardening change appears successful until mobile app login starts looping while desktop login remains normal.

What to check first
  • Identify the primary failure signal in the Desktop SSO Fixed, Mobile Webview Still Looping scenario.
  • Separate visible symptoms from the underlying technical dependency.
  • Describe the safest recovery path and the follow-up prevention work.
Checking checklist
  1. Summarize the current impact and the last known change.
  2. Collect direct evidence from logs, runtime state, and configuration before changing anything.
  3. Separate immediate recovery from permanent prevention work.
Recovery and prevention

Validate the failing browser container class before changing provider or app callback logic broadly.

Questions worth viewing together
What should you verify first when A SameSite fix solves desktop login and still breaks mobile webview SSO appears?

Community-field security problem inspired by mobile SSO discussions where SameSite fixes worked on desktop but not in webviews. A cookie fix proven in desktop Chrome does not guarantee the same outcome in embedded webviews.

What usually causes A SameSite fix solves desktop login and still breaks mobile webview SSO in production?

Teams often blame the mobile SDK when the real issue is browser-container cookie behavior.

What should you document after resolving A SameSite fix solves desktop login and still breaks mobile webview SSO?

Embedded browsers are their own security and cookie platform, not just a smaller desktop browser.