What is CVE-2026-48529?

CVE-2026-48529 is a medium-severity vulnerability in Github Github-mcp-server, classified under Improper Access Control. CVSS score: 6.0/10. Published 2026-06-26.

How severe is CVE-2026-48529?

Medium severity. CVSS v3 base score is 6.0 out of 10.

Vulnerability in Github Github-mcp-server

CVE-2026-48529

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 u…

CVSS v3 metric

CVSS v3 base score 6.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L.

Affected products

Github Github-mcp-server — versions >= 0.22.0, < 1.1.2

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-48529?: CVE-2026-48529 is a medium-severity vulnerability in Github Github-mcp-server, classified under Improper Access Control. CVSS score: 6.0/10. Published 2026-06-26.
How severe is CVE-2026-48529?: Medium severity. CVSS v3 base score is 6.0 out of 10.