CVE-2026-16496

HIGH 8.9

terraform-mcp-server vulnerable to cross-user credential inheritance if an MCP session ID is obtained by another user

CVSS Score

8.9

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-384
Vendor	hashicorp
Product	tooling
Published	Jul 28, 2026
Last Updated	Jul 28, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

HashiCorp / Tooling

0.3.0 < 1.1.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

discuss.hashicorp.com: https://discuss.hashicorp.com/t/hcsec-2026-23-multiple-vulnerabilities-impacting-hashicorp-terraform-mcp-server/77606

Credits

This issue was reported to HashiCorp by Juan Pablo Martinez Kuhn of Coinspect.