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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-52870

36
FAUCET Score

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.

First published: Jul 15, 2026Last modified: Jul 15, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.23.0, < 1.27.2CPE matchmatch criteria
cpe:2.3:a:lfprojects:mcp_python_sdk:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.6HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
4.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.24%
Probability of exploitation in next 30 days
EPSS Percentile
14.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0024 is in the 3rd percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: mcpFixed in: 1.27.2

Vendor Advisories (1)

pipGHSA-hvrp-rf83-w775high

MCP Python SDK: Experimental task handlers allow any client to access and cancel other clients' tasks

Jul 16, 2026

References

github.com / modelcontextprotocol/python-sdk/commit/62137874ff26dd74d2fea80ff528a7fd9ca7a5e7
Patch
github.com / modelcontextprotocol/python-sdk/pull/2720
Issue TrackingPatch
github.com / modelcontextprotocol/python-sdk/releases/tag/v1.27.2
Release Notes
github.com / modelcontextprotocol/python-sdk/security/advisories/GHSA-hvrp-rf83-w775
Vendor Advisory