EUVD-2025-200274
GHSA-w48q-cv73-mx4w
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Lifecycle Timeline
4Description
MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients. Prior to 1.24.0, The Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default for HTTP-based servers. When an HTTP-based MCP server is run on localhost without authentication with StreamableHTTPServerTransport or SSEServerTransport and has not enabled enableDnsRebindingProtection, a malicious website could exploit DNS rebinding to bypass same-origin policy restrictions and send requests to the local MCP server. This could allow an attacker to invoke tools or access resources exposed by the MCP server on behalf of the user in those limited circumstances. Note that running HTTP-based MCP servers locally without authentication is not recommended per MCP security best practices. This issue does not affect servers using stdio transport. This vulnerability is fixed in 1.24.0.
Analysis
A security vulnerability in MCP TypeScript SDK (CVSS 8.1) that allows dns rebinding protection. High severity vulnerability requiring prompt remediation. Vendor patch is available.
Technical Context
Vulnerability type not specified by vendor. CVSS 8.1 indicates high severity. Affects MCP TypeScript SDK.
Affected Products
['MCP TypeScript SDK']
Remediation
Apply the vendor-supplied patch immediately.
Priority Score
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External POC / Exploit Code
Leaving vuln.today