HashiCorpCVE-2026-16496
HashiCorp Tooling: session fixation
High8.9CVE-2026-16496 · Published Jul 28, 2026 · updated Jul 30, 2026
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 versions
| Package | Affected | Fixed in |
|---|---|---|
| Tooling Product | >= 0.3.0, < 1.1.0 | 1.1.0 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-384
More HashiCorp advisories
All HashiCorp| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Aug 7 | HashiCorp Consul: denial of service | Medium5.3 | 2.0.3+1 more |
| Aug 7 | Consul Community Edition and Consul Enterprise 1.20.1 through 2.0.2 are... | Medium4.2 | 2.0.3+1 more |
| Jul 29 | HashiCorp Tooling: server-side request forgery | High8.6 | 0.1.4 |
| Jul 29 | In consul-mcp-server | Critical10.0 | 0.1.4 |
| Jul 28 | The terraform-mcp-server before version 1.1.0 is vulnerable to a cross-tenant... | Critical10.0 | 1.1.0 |
| Jul 28 | HashiCorp Tooling: server-side request forgery | High8.6 | 1.1.0 |