Authorization bypass through user-controlled key in mcp-gateway - CVE-2026-109492
Published: November 11, 2026
Vulnerability identifier: #VU165836
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-109492
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to access another user's resources, disclose workload logs, or disrupt that user's workloads.
The vulnerability exists due to authorization bypass through a user-controlled key in Microsoft MCP Gateway when handling network requests for user resources. A remote user can send specially crafted requests to read another user's workload logs or disrupt that user's workloads.
Affected software
mcp-gateway
How to mitigate CVE-2026-109492
Install security update from vendor's website.
mcp-gateway - update to 1.0.0