[Reissue: Fix] /user/new Privilege Escalation

[yuneng-jiang]

Relevant issues

This is a re-issue of the PR: #19116

This was previously reverted due to failing CI/CD tests, but with the latest changes, those tests are now passing.

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• My PR passes all unit tests on make test-unit
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CI (LiteLLM team)

CI status guideline:

• 50-55 passing tests: main is stable with minor issues.
• 45-49 passing tests: acceptable but needs attention
• <= 40 passing tests: unstable; be careful with your merges and assess the risk.

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Type

🐛 Bug Fix
✅ Test

Changes

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Project	Deployment	Review	Updated (UTC)
litellm	Ready	Preview, Comment	Jan 18, 2026 0:50am