CVE-2026-48529
Medium
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.
SeverityMedium
CVSS6.0
Exploit probability—
ProductGithub.com/github/github-mcp-server
PublishedJun 26, 2026
First seenJun 26, 2026
Weakness typeCWE-284Improper access control
How to fix
Update
- github.com/github/github-mcp-server1.1.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/github/github-mcp-serverGo | 0.22.0 ≤ v < 1.1.2 | 1.1.2 |
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