Security Advisory

CVE-2026-48529

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-26 16:33:32

Last updated 2026-06-27 02:43:34

Assigner GitHub_M

CVSS score 6.0

State PUBLISHED

Description

GitHub MCP Server is GitHub's official MCP Server. From 0.22.0 until 1.1.2, when running in HTTP mode with --lockdown-mode enabled, the RepoAccessCache is implemented as a process-global singleton initialized with the first authenticated user's GraphQL client. All subsequent requests from different users share this singleton and their lockdown-related GraphQL queries are executed using the first user's credentials. The singleton is never updated to reflect later users' tokens. This vulnerability is fixed in 1.1.2.

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