HashiCorpCVE-2026-16496

HashiCorp Tooling: session fixation

CVE-2026-16496 · Published Jul 28, 2026 · updated Jul 30, 2026

High8.9

Fix: upgrade to 1.1.0 or later

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 versions

Package	Affected	Fixed in
Tooling Product	>= 0.3.0, < 1.1.0	1.1.0

Details and references

CVSS 3.1: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
Severity from: the vendor (its own CVE record or advisory)
Weakness: CWE-384

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