CVE-2026-16496
terraform-mcp-server vulnerable to cross-user credential inheritance if an MCP session ID is obtained by another user
HIGH 8.9
At a glance
- Source
- NVD
- EPSS
- EPSS 0.36 % · percentile 29 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- HashiCorp
- NVD status
- Deferred
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.
Weaknesses (CWE)
- CWE-384 — Session Fixation
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L | HashiCorp |
| CVSS 3.1 | HIGH 8.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L | NVD · security@hashicorp.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-49940
- GCVE · GCVE-0-2026-16496
Affected products
| Product | Versions |
|---|---|
| HashiCorp · Tooling | affected 0.3.0 < 1.1.0 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |