7.6

CVE-2026-52870: lfprojects mcp_python_sdk Missing Authorization

CVSS: 7.6v3.1HighAnalyzed
AliasesGHSA-hvrp-rf83-w775PYSEC-2026-3481CGA-6564-5qgc-78cq
Published 15-07-2026Last modified 16-07-2026
Open JSON

Vulnerability summary

CVE-2026-52870 is a high (CVSS 7.6) Missing Authorization vulnerability in lfprojects mcp_python_sdk. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 31.4% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.6/10
010
High · v3.1 (CVE.org)
EPSS score
0.39%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-97G3-PH7V-HFM3

Timeline

  1. 15-07-2026
    PublishedVulnerability first disclosed.
  2. 16-07-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.39%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

0.00 pp

From 0.39% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.39%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard3 products
  • kserve-huggingfaceserver-cuda-13.3All versions (No fix recorded) | < 0.21.0-r4
  • litellm< 1.93.0-r0 | < 1.91.2-r2
  • semgrep< 1.172.0-r1
Lfprojects1 product
Modelcontextprotocol1 product
PyPI1 product
  • mcp≥ 1.23.0, < 1.27.2
Wolfi1 product
  • semgrep< 1.172.0-r1

5 vendors · 7 products

References

9 links