CVE-2025-66416: mcp python sdk before 1.23.0 (exclusive); +1 more affected products

CVE-2025-66416. CVSS 3.1 base score 8.1 (HIGH, NVD). EPSS 0.00512 (percentile 0.42369), scored 17-Oct-2026.

Affected technology

mcp python sdk · before 1.23.0 (exclusive)
lfprojects

python-sdk · < 1.23.0
modelcontextprotocol

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · Passive user interaction

What an attacker can do

An attacker could invoke tools or access resources exposed by the MCP server on behalf of the user in those limited circumstances. Vendor/CNA’s CVSS 4.0 assessment (base score 7.6/10) rates confidentiality and integrity impact as high; availability impact as none.

Published 18-Oct-2026 18:49 UTC

CWE: CWE-1188
CCR priority: 32.5 /100 (P4)
CVSS 3.1: 8.1 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N · NVD
EPSS: 0.00512 · percentile 0.42369 · 2026-10-17
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-18 18:49:36.049749+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2025-66416.html