CVE-2026-16498 — CRITICAL (10.0)

Vulnerability Description

The terraform-mcp-server before version 1.1.0 is vulnerable to a cross-tenant credential reuse issue in the streamable-HTTP stateless transport mode that may allow one user's Terraform token to be used to execute tool calls on behalf of subsequent users. This vulnerability, CVE-2026-16498, is fixed in terraform-mcp-server 1.1.0.

CVSS Score

10.0

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

LOW

Related Weaknesses (CWE)

CWE-488

References

https://discuss.hashicorp.com/t/hcsec-2026-23-multiple-vulnerabilities-impacting

FAQ

What is CVE-2026-16498?

CVE-2026-16498 is a vulnerability with a CVSS score of 10.0 (CRITICAL). The terraform-mcp-server before version 1.1.0 is vulnerable to a cross-tenant credential reuse issue in the streamable-HTTP stateless transport mode that may allow one user's Terraform token to be use...

How severe is CVE-2026-16498?

CVE-2026-16498 has been rated CRITICAL with a CVSS base score of 10.0/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-16498?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.