CVE-2026-16496 — HIGH (8.9)

Vulnerability 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.

CVSS Score

8.9

HIGH

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

LOW

Related Weaknesses (CWE)

CWE-384

References

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

FAQ

What is CVE-2026-16496?

CVE-2026-16496 is a vulnerability with a CVSS score of 8.9 (HIGH). 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...

How severe is CVE-2026-16496?

CVE-2026-16496 has been rated HIGH with a CVSS base score of 8.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-16496?

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