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Vulnerability IntelligenceCVE-2026-16496

CVE-2026-16496

HIGH8.9

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

Published Jul 28, 2026

Modified 2 weeks ago

Details

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.

References

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

https://www.cve.org/CVERecord?id=CVE-2026-16496

CVSS Analysis

CVSS v3.1

8.9

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

HighAC:H

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

Scope

ChangedS:C

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

LowA:L

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

Weakness Type (CWE)

Authentication

Session Fixation

Ecosystems

Timeline

PublishedJul 28, 2026

ModifiedJul 28, 2026

CVE-2026-16496 | Mondoo Vulnerability Intelligence