Bump ModelContextProtocol from 1.3.0 to 1.4.0#371
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--- updated-dependencies: - dependency-name: ModelContextProtocol dependency-version: 1.4.0 dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>
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Updated ModelContextProtocol from 1.3.0 to 1.4.0.
Release notes
Sourced from ModelContextProtocol'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 newInheritEnvironmentVariablesoption onStdioClientTransportOptionsfor 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, andDELETEon a Streamable HTTP session now requires the same authenticated user that initiated the session.What's Changed
InheritEnvironmentVariablestoStdioClientTransportOptions#1563 by @halter73 (co-authored by @Copilot)HandleDeleteRequestAsyncnow mirrors theHasSameUserIdcheck already enforced on GET and POST. ADELETEwith a validMcp-Session-Idbut a different authenticated user now returns403 Forbiddeninstead of terminating the session — defense-in-depth against a leaked session ID being used to DoS the original owner.IdentityAssertionGrantProviderand supporting option/response types inModelContextProtocol.Authenticationimplementing 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
Repository Infrastructure Updates
Acknowledgements
Full Changelog: modelcontextprotocol/csharp-sdk@v1.3.0...v1.4.0
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