Security Bulletin
Summary
In consul-mcp-server, versions 0.1.0 up to 0.1.3 did not restrict how the Consul backend address was supplied, allowing a connected client to override the server's configured Consul address via a request header. This may allow a malicious client to redirect the server's Consul API traffic to an attacker-controlled endpoint, potentially exfiltrating the Consul token configured on the server. This vulnerability, CVE-2026-16328, is fixed in consul-mcp-server 0.1.4.
Vulnerability Details
CVEID: CVE-2026-16328
DESCRIPTION: The per-request address override feature could be abused by a connected client to cause the server to direct its Consul API traffic, including any configured credentials, to an unintended destination. This may lead to credential exfiltration or server-side request forgery against targets reachable from the server. The issue affects deployments where the MCP server is reachable by clients that are not fully trusted. Deployments with no Consul token configured in the environment are not exposed to credential exfiltration.
CWE: CWE-918: Server-Side Request Forgery (SSRF)
CVSS Source: HashiCorp Inc.
CVSS Base score: 8.6
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| consul-mcp-server | affected from 0.1.0 up to 0.1.4 |
Remediation/Fixes
Customers should evaluate the risk associated with this issue and consider upgrading to consul-mcp-server 0.1.4. Operators who cannot upgrade immediately should restrict network access to the MCP server to trusted clients.
Get Notified about Future Security Bulletins
References
Link to HashiCorp Security Bulletin: https://discuss.hashicorp.com/t/hcsec-2026-24-multiple-vulnerabilities-impacting-hashicorp-consul-mcp-server/77612
Acknowledgement
This issue was identified by HE WEI (ギカク).
Change History
29 Jul 2026: Initial Publication
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Disclaimer
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Document Location
Worldwide
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Document Information
Modified date:
29 July 2026
Initial Publish date:
29 July 2026
UID
ibm17281826