aminghadersohi opened a new pull request, #43606:
URL: https://github.com/apache/superset/pull/43606

   ### SUMMARY
   
   When several tabs reach `/login/?next=...` after a session expires, 
completing login in one tab authenticates the shared browser session. 
Refreshing another tab then takes the login view's already-authenticated 
branch, which previously discarded `next` and sent the user to the index.
   
   This marks safe redirect destinations while the request is known to be 
anonymous. An already-authenticated login request may honor `next` only when a 
short-lived signed marker proves that the same destination was observed before 
authentication. Unmarked authenticated login requests still go to the index, 
preserving the existing protection against redirect loops when an authenticated 
user is sent to login after a permission denial.
   
   Markers expire after 15 minutes, are bound to the exact `next` value, and do 
not grant authorization. Destinations still pass Flask-AppBuilder's 
safe-redirect validation; backslash-containing destinations are rejected so 
browser and server URL parsing cannot disagree.
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   
   Not applicable; this changes server-side redirect behavior without changing 
the UI.
   
   ### TESTING INSTRUCTIONS
   
   Automated:
   
   ```bash
   PYTHONPATH="$PWD/superset-core/src:$PWD" pytest -q 
tests/unit_tests/views/test_auth.py
   uvx pre-commit run --files superset/views/auth.py 
tests/unit_tests/views/test_auth.py
   ```
   
   The regression suite covers:
   
   - marking a safe `next` while anonymous;
   - restoring the original dashboard after another tab authenticates;
   - retaining the index fallback for unmarked authenticated requests;
   - tampered, expired, mismatched, and non-string markers;
   - external, scheme-relative, script-scheme, control-character, triple-slash, 
and backslash redirect forms;
   - repeated query parameters and `SCRIPT_NAME`/application-root deployments.
   
   Manual:
   
   1. Configure a short `PERMANENT_SESSION_LIFETIME`.
   2. Log in and open multiple dashboard tabs.
   3. Let the session expire and allow each tab to reach the login page.
   4. Complete login in one tab.
   5. Refresh the remaining tabs and verify each returns to its original 
dashboard.
   6. As an authenticated user, request a page without permission and verify 
the login redirect does not loop back to the denied page.
   
   ### ADDITIONAL INFORMATION
   
   - [ ] Has associated issue:
   - [ ] Required feature flags:
   - [ ] Changes UI
   - [ ] Includes DB Migration (follow approval process in 
[SIP-59](https://github.com/apache/superset/issues/13351))
     - [ ] Migration is atomic, supports rollback & is backwards-compatible
     - [ ] Confirm DB migration upgrade and downgrade tested
     - [ ] Runtime estimates and downtime expectations provided
   - [ ] Introduces new feature or API
   - [ ] Removes existing feature or API
   


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