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Return HTTP 403 for invalid Origin headers #1353

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Merged
pja-ant merged 1 commit into from
Sep 22, 2025
Merged

Return HTTP 403 for invalid Origin headers #1353

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2 changes: 1 addition & 1 deletion 2 src/mcp/server/transport_security.py
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Original file line number Diff line number Diff line change
Expand Up @@ -122,6 +122,6 @@ async def validate_request(self, request: Request, is_post: bool = False) -> Res
# Validate Origin header
origin = request.headers.get("origin")
if not self._validate_origin(origin):
return Response("Invalid Origin header", status_code=400)
return Response("Invalid Origin header", status_code=403)

return None
2 changes: 1 addition & 1 deletion 2 tests/server/test_sse_security.py
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Expand Up @@ -127,7 +127,7 @@ async def test_sse_security_invalid_origin_header(server_port: int):

async with httpx.AsyncClient() as client:
response = await client.get(f"http://127.0.0.1:{server_port}/sse", headers=headers)
assert response.status_code == 400
assert response.status_code == 403
assert response.text == "Invalid Origin header"

finally:
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2 changes: 1 addition & 1 deletion 2 tests/server/test_streamable_http_security.py
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Expand Up @@ -155,7 +155,7 @@ async def test_streamable_http_security_invalid_origin_header(server_port: int):
json={"jsonrpc": "2.0", "method": "initialize", "id": 1, "params": {}},
headers=headers,
)
assert response.status_code == 400
assert response.status_code == 403
assert response.text == "Invalid Origin header"

finally:
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