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CVE-2026-16496— terraform-mcp-server vulnerable to cross-user credential inheritance if an MCP session ID is obtained by another user

Quick assessment

Affected
HashiCorp Tooling
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HashiCorp Tooling是美国HashiCorp公司的系统工具组件。 HashiCorp Tooling 1.1.0之前版本存在会话机制问题漏洞，该漏洞源于streamable-HTTP stateful transport模式存在授权绕过，可能允许用户获取其他用户的MCP session ID后使用该用户的Terraform凭据执行工具调用。

CVSS 8.9 · High EPSS 0.36% · P27

Affected Version Matrix 1

VendorProduct Version RangeStatus
HashiCorp Tooling 0.3.0< 1.1.0 affected
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I. Basic Information for CVE-2026-16496

Vulnerability Information
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Vulnerability Title
terraform-mcp-server vulnerable to cross-user credential inheritance if an MCP session ID is obtained by another user
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
会话固定
Source: CVE Program / CVE List V5
Vulnerability Title
HashiCorp Tooling 会话机制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HashiCorp Tooling是美国HashiCorp公司的系统工具组件。 HashiCorp Tooling 1.1.0之前版本存在会话机制问题漏洞，该漏洞源于streamable-HTTP stateful transport模式存在授权绕过，可能允许用户获取其他用户的MCP session ID后使用该用户的Terraform凭据执行工具调用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
HashiCorp Tooling 0.3.0 ~ 1.1.0 -

II. Public POCs for CVE-2026-16496

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III. Intelligence Information for CVE-2026-16496

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Vendor Advisories for CVE-2026-16496 (1)

Same Patch Batch · HashiCorp · 2026-07-28 · 3 CVEs total

CVE-2026-16498 10.0 CRITICAL terraform-mcp-server vulnerable to cross-tenant credential reuse in streamable-HTTP statel
CVE-2026-14869 8.6 HIGH terraform-mcp-server vulnerable to server side request forgery leading to token exposure

IV. Related Vulnerabilities

Same product: Tooling
Same vendor: HashiCorp
Same weakness: CWE-384

V. Comments for CVE-2026-16496

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