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

> CVE-2026-16496: terraform-mcp-server vulnerable to cross-user credential inheritance if an MCP session ID is obtained by another user. CVSS 8.9 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-16496
Last updated: 2026-10-23T23:10:00Z

- Published: 2026-07-28 17:57 UTC · Updated: 2026-10-23 23:10 UTC · Assigner: HashiCorp
- CVSS: 8.9 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
- EPSS: 0.36%, 29th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-384

## 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.

## Affected vendors and products

- HashiCorp: Tooling

## Tracked companies

- [HashiCorp](https://rewindex.com/company/hashicorp.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-16496)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-16496)
- [https://discuss.hashicorp.com/t/hcsec-2026-23-multiple-vulnerabilities-impacting-hashicorp-terraform-mcp-server/77606](https://discuss.hashicorp.com/t/hcsec-2026-23-multiple-vulnerabilities-impacting-hashicorp-terraform-mcp-server/77606)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-16496 · Markdown: https://rewindex.com/cve/CVE-2026-16496.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-16496 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:53.818Z