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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History
Fri, 26 Jun 2026 16:45:00 +0000
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| 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. | |
| Title | GitHub MCP Server: Lockdown mode singleton in HTTP server causes cross-user GraphQL client confusion | |
| Weaknesses | CWE-284 | |
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-06-26T16:33:32.688Z
Reserved: 2026-05-21T16:18:10.619Z
Link: CVE-2026-48529
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
Updated: 2026-06-26T17:30:05Z