What’s Vulnerable › Vulnerabilities
CVE-2026-16496: terraform-mcp-server vulnerable to cross-user credential inheritance if an MCP session ID is obtained by another user
- Severity: high (CVSS 8.9 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-28 · updated 2026-10-23
- Weakness: CWE-384
Description
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
How to fix
Upgrade to a fixed version: HashiCorp Tooling 1.1.0. Check the vendor advisory for mitigations.
References
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