CVE-2026-16496
Auth bypass in terraform-mcp-server lets attackers reuse session IDs to act as other users.
Is CVE-2026-16496 being exploited?
Not confirmed. CVE-2026-16496 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.37% probability of exploitation in the next 30 days.
How severe is CVE-2026-16496?
CVE-2026-16496 is rated High with a CVSS score of 8.9. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-16496?
Yes. A fix has been recorded for CVE-2026-16496. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-16496 affect?
CVE-2026-16496 affects terraform-mcp-server <1.1.0, MCP streamable-HTTP transport mode. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-16496?
Upgrade to terraform-mcp-server 1.1.0; rotate credentials and invalidate existing sessions.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Session-ID reuse allows attacker to execute Terraform operations as victim, enabling unauthorized resource provisioning, modification, and credential misuse.
Immediate action required
- affected>= 0.3.0 and < 1.1.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.