CVE-2026-16496
Published:July 28, 2026
Updated:August 06, 2026
The terraform-mcp-server before version 1.1.0 is vulnerable to an authorization bypass in the streamable-HTTP stateful transport mode that may allow a user who obtains another user's MCP session ID to have their tool calls executed using that user's Terraform credentials. This vulnerability, CVE-2026-16496, is fixed in terraform-mcp-server 1.1.0.
Affected Packages
https://github.com/hashicorp/terraform-mcp-server.git (GITHUB):
Affected version(s) >=v0.1.0 <v1.1.0Fix Suggestion:
Update to version v1.1.0github.com/hashicorp/terraform-mcp-server (GO):
Affected version(s) >=v0.1.0 <v1.0.1-0.20260714174952-0a0dee37613fFix Suggestion:
Update to version v1.0.1-0.20260714174952-0a0dee37613fRelated Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.5
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
LOW
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
LOW
CVSS v3
Base Score:
8.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
LOW
Weakness Type (CWE)
Session Fixation
EPSS
Base Score:
0.27