What is CVE-2026-16496?

CVE-2026-16496 is a high-severity vulnerability in Hashicorp Tooling, classified under Session Fixation. CVSS score: 8.9/10. Published 2026-07-28.

How severe is CVE-2026-16496?

High severity. CVSS v3 base score is 8.9 out of 10.

Vulnerability in Hashicorp Tooling

CVE-2026-16496

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 t…

CVSS v3 metric

CVSS v3 base score 8.9 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L.

Affected products

Hashicorp Tooling — versions 0.3.0

Weakness classification (CWE)

CWE-384 — Session Fixation

References

security@hashicorp.com

Frequently asked questions

What is CVE-2026-16496?: CVE-2026-16496 is a high-severity vulnerability in Hashicorp Tooling, classified under Session Fixation. CVSS score: 8.9/10. Published 2026-07-28.
How severe is CVE-2026-16496?: High severity. CVSS v3 base score is 8.9 out of 10.