CVE-2026-16496: high-severity vulnerability in HashiCorp Tooling
terraform-mcp-server vulnerable to cross-user credential inheritance if an MCP session ID is obtained by another user
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.9epss 0.4%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
Affected products
HashiCorp · ToolingRelated CVEs — HashiCorp Tooling
In the same product, most dangerous first.
CVE-2026-4660HIGHGo-getter may allow to arbitrary filesystem reads through git operationsEPSS 0.6%CVE-2026-16326CRITICALconsul-mcp-server vulnerable to cross-tenant credential reuse in streamable-HTTP stateless modeEPSS 0.5%CVE-2025-13357HIGHVault Terraform Provider Applied Incorrect Defaults for LDAP Auth MethodEPSS 0.5%CVE-2026-8715CRITICALVault Secrets Operator vulnerable to arbitrary file read and credential exfiltration via AppRole secretIDPathEPSS 0.5%CVE-2026-16498CRITICALterraform-mcp-server vulnerable to cross-tenant credential reuse in streamable-HTTP stateless modeEPSS 0.5%CVE-2026-16328HIGHconsul-mcp-server vulnerable to server side request forgery leading to token exposureEPSS 0.4%