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.
CVE-2026-16498
CRITICALPre-NVD 10.010.0—
EchelonGraph scoreHIGH confidence
Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-28. a secondary CVSS source baseline 10.0; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 10.0Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 10.0
- EG Score
- 10.0(high)
- EG Risk
- 60(Track)EG Risk 60/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity100% × 45%Exploitation0% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
Published
July 28, 2026
Last Modified
July 28, 2026
Advisory Details (1)
Auto-updated Jul 28, 2026No patch confirmed yet.
generic
HCSEC-2026-23 - Multiple vulnerabilities impacting HashiCorp Terraform MCP Server - Security - HashiCorp Discuss
https://discuss.hashicorp.com/t/hcsec-2026-23-multiple-vulnerabilities-impacting-hashicorp-terraform-mcp-server/77606Vendor Advisories for CVE-2026-16498(2)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 7× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-29 06:34 UTCGHSA enrichment
- 2026-07-29 02:53 UTCGHSA enrichment
- 2026-07-28 23:11 UTCEG score recompute
- 2026-07-28 23:11 UTCGHSA enrichment
- 2026-07-28 19:27 UTCEG score recompute
- 2026-07-28 19:00 UTCEG score recompute
- 2026-07-28 18:22 UTCEG score recompute
Frequently asked(4)
What is CVE-2026-16498?
CVE-2026-16498 is a critical vulnerability published on July 28, 2026. 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…
When was CVE-2026-16498 disclosed?
CVE-2026-16498 was first published in the National Vulnerability Database on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-16498?
CVE-2026-16498 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-16498?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16498, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-16498
Is Your Infrastructure Affected by CVE-2026-16498?
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