{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-16496","assignerOrgId":"67fedba0-ff2e-4543-ba5b-aa93e87718cc","state":"PUBLISHED","assignerShortName":"HashiCorp","dateReserved":"2026-07-21T16:53:07.388Z","datePublished":"2026-07-28T17:57:36.795Z","dateUpdated":"2026-07-28T18:43:58.385Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","platforms":["64 bit","32 bit","x86","ARM","MacOS","Windows","Linux"],"product":"Tooling","repo":"https://github.com/hashicorp/terraform-mcp-server","vendor":"HashiCorp","versions":[{"lessThan":"1.1.0","status":"affected","version":"0.3.0","versionType":"semver"}]}],"credits":[{"lang":"en","value":"This issue was reported to HashiCorp by Juan Pablo Martinez Kuhn of Coinspect."}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>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.</p><br/>"}],"value":"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."}],"impacts":[{"capecId":"CAPEC-60","descriptions":[{"lang":"en","value":"CAPEC-60: Reusing Session IDs (Session Replay)"}]}],"metrics":[{"cvssV3_1":{"baseScore":8.9,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-384","description":"CWE-384: Session Fixation","lang":"en","type":"CWE"}]}],"providerMetadata":{"orgId":"67fedba0-ff2e-4543-ba5b-aa93e87718cc","shortName":"HashiCorp","dateUpdated":"2026-07-28T17:57:36.795Z"},"references":[{"url":"https://discuss.hashicorp.com/t/hcsec-2026-23-multiple-vulnerabilities-impacting-hashicorp-terraform-mcp-server/77606"}],"source":{"advisory":"HCSEC-2026-23","discovery":"EXTERNAL"},"title":"terraform-mcp-server vulnerable to cross-user credential inheritance if an MCP session ID is obtained by another user"},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-28T18:42:15.101188Z","id":"CVE-2026-16496","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-28T18:43:58.385Z"}}]}}