CVE-2026-48529

Name: CVE-2026-48529
Creator: NVD / NIST
Published: 2026-06-26T17:16:33.82+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6/10

Last modified Jun 26, 2026

CVE-2026-48529 is a medium-severity vulnerability rated 6/10 on the CVSS scale. 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.

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

6/10

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

Weakness Enumeration

CWE-284

References

https://github.com/github/github-mcp-server/security/advisories/GHSA-pjp5-fpmr-3349

Timeline

Published: Jun 26, 2026
Last Modified: Jun 26, 2026
Status: Deferred

Frequently Asked Questions

What is CVE-2026-48529?

How severe is CVE-2026-48529?

CVE-2026-48529 has a CVSS score of 6/10 (MEDIUM severity).

How do I fix CVE-2026-48529?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-48529?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST