CVE-2026-16496

HashiCorp ToolingVulnerabilityCVSS 8.9

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.

No public exploitation has been reported so far. No distribution fix is listed yet; apply vendor mitigations and monitor.

Recommended action: Track your distribution's security tracker and apply the fix as soon as it ships.

CVE-2026-16496 HashiCorp Tooling Vulnerability

Severity metrics

CVSS 3.1 : 8.9 HIGH

Attack vectorNetwork (remote)

Attack complexityHigh

Privileges requiredNone

User interactionNone

ScopeChanged

Confidentiality impactHigh

Integrity impactHigh

Availability impactLow

Vector: AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L

Affected & fixed versions by distribution

Versions are the native distribution strings (backport-aware): RHEL/Debian/SUSE backport fixes, so compare with the distro version comparator (dpkg / rpm / vercmp), not the upstream version.

No affected package in the tracked watchlist yet (Debian, Ubuntu, Arch, SUSE, Red Hat...). Triage may still be pending.

Sources

Advisory NVD CVE.org

Published 2026-07-28 · source: NVD