CVE-2026-16326 PUBLISHED

consul-mcp-server vulnerable to cross-tenant credential reuse in streamable-HTTP stateless mode

Assigner: HashiCorp
Reserved: 20.07.2026 Published: 29.07.2026 Updated: 29.07.2026

In consul-mcp-server, versions 0.1.0 up to 0.1.3 did not properly isolate session state in stateless mode, which may allow one client's Consul authentication token to be used for subsequent requests from other clients. This vulnerability (CVE-2026-16326) is fixed in consul-mcp-server 0.1.4.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
CVSS Score: 10

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	HashiCorp
Product	Tooling
Versions	Default: unaffected affected from 0.1.0 to 0.1.4 (excl.)

Credits

This issue was reported by an internal HashiCorp team.

References

https://discuss.hashicorp.com/t/hcsec-2026-24-multiple-vulnerabilities-impacting-hashicorp-consul-mcp-server/77612

Problem Types

CWE-488: Exposure of Data Element to Wrong Session CWE

Impacts

CAPEC-60: Reusing Session IDs (Session Replay)