CVE-2026-16496: Hashicorp Tooling

High severity, CVSS 8.9. EPSS: 0.4% chance of exploitation in the next 30 days.

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 products

• Hashicorp Tooling: from 0.3.0, before 1.1.0 (fixed in 1.1.0)

Published 2026-07-28. Last modified 2026-07-30.