CVE-2026-16498 PUBLISHED

terraform-mcp-server vulnerable to cross-tenant credential reuse in streamable-HTTP stateless mode

Assigner: HashiCorp
Reserved: 21.07.2026 Published: 28.07.2026 Updated: 28.07.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
CVSS Score: 10

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	HashiCorp
Product	Tooling
Versions	Default: unaffected affected from 0.3.0 to 1.1.0 (excl.)

Credits

This issue was identified by an internal team.

References

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

Problem Types

CWE-488: Exposure of Data Element to Wrong Session CWE

Impacts

CAPEC-60: Reusing Session IDs (Session Replay)