René's URL Explorer Experiment


Title: Validate DCR redirect_uris with HTTPS-or-loopback policy by KirtiRamchandani · Pull Request #2860 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Validate DCR redirect_uris with HTTPS-or-loopback policy by KirtiRamchandani · Pull Request #2860 · modelcontextprotocol/python-sdk

X Title: Validate DCR redirect_uris with HTTPS-or-loopback policy by KirtiRamchandani · Pull Request #2860 · modelcontextprotocol/python-sdk

Description: Problem Dynamic client registration accepts dangerous redirect_uris such as javascript:, data:, file:, cleartext non-loopback http://, and URIs with fragments. The SDK already enforces an HTTPS-or-loopback policy for issuer URLs, but DCR did not apply the same checks. Root cause RegistrationHandler passed client-submitted redirect_uris straight through after Pydantic URL parsing. AnyUrl accepts any syntactically valid scheme. Fix Add validate_registered_redirect_uri() alongside the existing issuer URL validator Reject unsafe schemes, non-loopback HTTP, and fragment-bearing redirect URIs during /register Return invalid_client_metadata when validation fails Testing Extended tests/server/auth/test_routes.py python3 -m pytest tests/server/auth/test_routes.py -q --confcutdir=tests/server/auth Fixes #2629

Open Graph Description: Problem Dynamic client registration accepts dangerous redirect_uris such as javascript:, data:, file:, cleartext non-loopback http://, and URIs with fragments. The SDK already enforces an HTTPS-or-...

X Description: Problem Dynamic client registration accepts dangerous redirect_uris such as javascript:, data:, file:, cleartext non-loopback http://, and URIs with fragments. The SDK already enforces an HTTPS-or-...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2860

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55187a0 Validate DCR redirect_uris with HTTPS-or-loopback policy KirtiRamchandani Jun 14, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2860/commits/55187a073180bda1b69992cfe93e5413d0abdb66
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