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Bump ModelContextProtocol.AspNetCore from 1.3.0 to 1.4.0#243

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Bump ModelContextProtocol.AspNetCore from 1.3.0 to 1.4.0#243
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Updated ModelContextProtocol.AspNetCore from 1.3.0 to 1.4.0.

Release notes

Sourced from ModelContextProtocol.AspNetCore's releases.

1.4.0

v1.4.0 introduces support for the Identity Assertion Authorization Grant (ID-JAG) flow via the new IdentityAssertionGrantProvider, enabling enterprise SSO scenarios where users authenticate once via their enterprise Identity Provider and access MCP servers without per-server authorization prompts. The release also adds a new InheritEnvironmentVariables option on StdioClientTransportOptions for controlling the child server's environment, alongside two security hardening fixes: the stdio client transport no longer enumerates child-process environment variables in Trace logs, and DELETE on a Streamable HTTP session now requires the same authenticated user that initiated the session.

What's Changed

  • Stop logging stdio transport environment variables #​1538 by @​halter73 (co-authored by @​Copilot)
  • Add InheritEnvironmentVariables to StdioClientTransportOptions #​1563 by @​halter73 (co-authored by @​Copilot)
  • Validate user on Streamable HTTP session DELETE #​1604 by @​halter73 (co-authored by @​Copilot)
    • HandleDeleteRequestAsync now mirrors the HasSameUserId check already enforced on GET and POST. A DELETE with a valid Mcp-Session-Id but a different authenticated user now returns 403 Forbidden instead of terminating the session — defense-in-depth against a leaked session ID being used to DoS the original owner.
  • Add Enterprise Managed Authorization (SEP-990) support #​1305 by @​aniket-okta (backported in #​1625)
    • Adds IdentityAssertionGrantProvider and supporting option/response types in ModelContextProtocol.Authentication implementing the Identity Assertion Authorization Grant flow: RFC 8693 token exchange at the enterprise IdP (ID Token → JWT Authorization Grant) followed by RFC 7523 JWT bearer grant at the MCP authorization server (JAG → access token). See the new Cross-Application Access section in the transport docs for full usage details.

Documentation Updates

  • Fix broken links to MCP Tasks specification #​1594 by @​tarekgh

Repository Infrastructure Updates

  • Update release processes to support release servicing branches #​1620 by @​jeffhandley (co-authored by @​Copilot)

Acknowledgements

  • @​aniket-okta made their first contribution in #​1305
  • @​felixweinberger submitted issue #​949 (resolved by #​1305)
  • @​eiriktsarpalis @​ericstj @​PranavSenthilnathan reviewed pull requests

Full Changelog: modelcontextprotocol/csharp-sdk@v1.3.0...v1.4.0

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---
updated-dependencies:
- dependency-name: ModelContextProtocol.AspNetCore
  dependency-version: 1.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot Bot added .NET Pull requests that update .NET code dependencies Pull requests that update a dependency file labels Jun 8, 2026
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Summary

Summary
Generated on: 06/08/2026 - 18:44:16
Parser: MultiReport (3x Cobertura)
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Classes: 61
Files: 58
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Branch coverage: 66.4% (987 of 1485)
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Method coverage: Feature is only available for sponsors

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