Missing Authorization Affecting @modelcontextprotocol/sdk package, versions >=1.24.0 <1.32.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published21 Oct 2026
- disclosed20 Oct 2026
- creditCipher by Causal Security
Introduced: 20 Oct 2026
NewCVE-2026-111767 (opens in a new tab)How to fix?
Upgrade @modelcontextprotocol/sdk to version 1.32.0 or higher.
Overview
@modelcontextprotocol/sdk is a Model Context Protocol implementation for TypeScript
Affected versions of this package are vulnerable to Missing Authorization via the InMemoryTaskStore implementation, where tasks created within one session are accessible to requests from other sessions. An attacker with access to a shared MCP server can read, modify, or retrieve results of tasks belonging to other users by supplying a known or guessed task ID, bypassing session-level isolation.
Note: This is only exploitable if the HTTP server passes taskStore to McpServer or Server.