CVE-2026-48529

MediumCVSS 6.0/10Last modified Jun 27, 2026

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.

Metrics

CVSS 3.1 6.0/10CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L

Weakness enumeration

CWE-284

Affected software

No affected versions have been published.

Timeline

Published
Jun 26, 2026
Last modified
Jun 27, 2026
NVD status
Deferred

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CVE-2026-48529: Medium severity, CVSS 6.0 | Vulnix