The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). From 1.23.0 until 1.27.2, default handlers installed by server.experimental.enable_tasks() for tasks/list, tasks/get, tasks/result, and tasks/cancel operate only on task identifiers without recording the session that created each task, allowing any connected client to enumerate, read results from, consume messages for, or cancel other clients' tasks. This issue is fixed in version 1.27.2.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
Low
Partial data modification
Availability
Low
Partial disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Lfprojects Mcp_Python_Sdk
cpe:2.3:a:lfprojects:mcp_python_sdk:*:*:*:*:*:*:*:*
|
1.23.0
|
1.27.2
|
References 4
https://github.com/modelcontextprotocol/python-sdk/commit/62137874ff26dd74d2fea…
security-advisories@github.com
https://github.com/modelcontextprotocol/python-sdk/pull/2720
security-advisories@github.com
https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.27.2
security-advisories@github.com
https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-hvr…
security-advisories@github.com