terraform-mcp-server v1.1.0 Auth Bypass in Streamable-HTTP Mode
CVE-2026-16496 Published on July 28, 2026
terraform-mcp-server vulnerable to cross-user credential inheritance if an MCP session ID is obtained by another user
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.
Weakness Type
Session Fixation
Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.
Affected Versions
HashiCorp Tooling:- Version 0.3.0 and below 1.1.0 is affected.