by Kastro
Paper/Archive/CVE-2026-16498

CVE-2026-16498

HashiCorp Tooling — terraform-mcp-server vulnerable to cross-tenant credential reuse in streamable-HTTP stateless mode

EPSS 0.5%CVSS 10.0
critical.is priorityof 100
38
CVSS 10.0 (CNA)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 39.6.396 × 207.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

The terraform-mcp-server before version 1.1.0 is vulnerable to a cross-tenant credential reuse issue in the streamable-HTTP stateless transport mode that may allow one user's Terraform token to be used to execute tool calls on behalf of subsequent users. This vulnerability, CVE-2026-16498, is fixed in terraform-mcp-server 1.1.0.

Affected

ProductAffectedFixed inSource
Tooling0.3.0 – < 1.1.01.1.0CNA

Scores by source

HashiCorp (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refdiscuss.hashicorp.com/t/hcsec-2026-23-multiple-vulnerabilities-impacting-hashicorp-terraform-mcp-server/77606