CVE-2026-16498: CWE-488: Exposure of Data Element to Wrong Session in HashiCorp Tooling
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.
AI Analysis
Technical Summary
The terraform-mcp-server before version 1.1.0 suffers from a cross-tenant credential reuse vulnerability (CWE-488) in its streamable-HTTP stateless transport mode. This flaw allows an attacker to reuse a Terraform token from one user to execute actions as that user in subsequent sessions, effectively exposing data elements to the wrong session. The vulnerability has a CVSS 3.1 base score of 10.0, indicating critical severity with network attack vector, no required privileges or user interaction, and complete confidentiality, integrity, and partial availability impact. The issue is resolved in version 1.1.0 of terraform-mcp-server.
Potential Impact
An attacker can reuse another user's Terraform token to execute tool calls on their behalf, leading to full compromise of confidentiality and integrity, and partial impact on availability. This enables unauthorized access and potentially malicious actions within the affected environment.
Mitigation Recommendations
Upgrade terraform-mcp-server to version 1.1.0 or later, where this vulnerability is fixed. Patch status is confirmed by the vendor advisory stating the issue is resolved in version 1.1.0.
CVE-2026-16498: CWE-488: Exposure of Data Element to Wrong Session in HashiCorp Tooling
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 v3.1
Score 10.0critical
Affected software
HashiCorp
Tooling
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The terraform-mcp-server before version 1.1.0 suffers from a cross-tenant credential reuse vulnerability (CWE-488) in its streamable-HTTP stateless transport mode. This flaw allows an attacker to reuse a Terraform token from one user to execute actions as that user in subsequent sessions, effectively exposing data elements to the wrong session. The vulnerability has a CVSS 3.1 base score of 10.0, indicating critical severity with network attack vector, no required privileges or user interaction, and complete confidentiality, integrity, and partial availability impact. The issue is resolved in version 1.1.0 of terraform-mcp-server.
Potential Impact
An attacker can reuse another user's Terraform token to execute tool calls on their behalf, leading to full compromise of confidentiality and integrity, and partial impact on availability. This enables unauthorized access and potentially malicious actions within the affected environment.
Mitigation Recommendations
Upgrade terraform-mcp-server to version 1.1.0 or later, where this vulnerability is fixed. Patch status is confirmed by the vendor advisory stating the issue is resolved in version 1.1.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- HashiCorp
- Date Reserved
- 2026-07-21T17:19:22.057Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a68f3749c2644c7f803d81c
Added to database: 07/28/2026, 18:22:44 UTC
Last enriched: 07/29/2026, 15:40:10 UTC
Last updated: 09/12/2026, 22:01:31 UTC
Views: 85
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