CVE-2026-16496CWE-384

CVE-2026-16496

High · published July 28, 2026

CVSS v3.1
8.9
EPSS
0%
Percentile
28.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.9 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
CVSS v4.0
Not supplied
EPSS
0.00355 · 28.0th percentile
Weakness
CWE-384 · Session Fixation
Published
2026-07-28T23:17Z
References (1)
https://discuss.hashicorp.com/t/hcsec-2026-23-multiple-vulnerabilities-impacting-hashicorp-terraform-mcp-server/77606 · [email protected]
EPSS history
Timeline
  • 28 JUL 17:57Z
    terraform-mcp-server vulnerable to cross-user credential inheritance if an MCP session ID is obtained by another user
    cvelistv5