IBM ContextForge MCP Gateway Vulnerability in Credential Handling
CVE-2026-110279

8.1HIGH

Key Information:

Vendor

IBM
Status
Contextforge Mcp Gateway
Vendor
CVE Published:
13 November 2026

What is CVE-2026-110279?

The IBM ContextForge MCP Gateway versions 1.0.0 to 1.1.0 have a vulnerability that allows improper handling of credentials. Specifically, the X-Upstream-Authorization request header can be manipulated to override the credentials managed by the gateway, which impacts OAuth-based authentication methods such as authorization_code and client_credentials, as well as bearer and basic authentication. This exploitation can enable authenticated users to execute upstream requests with unauthorized credentials, effectively bypassing individual user permissions and compromising audit integrity.

Affected Version(s)

ContextForge MCP Gateway 1.0.0 <= 1.1.0

References

https://www.ibm.com/support/pages/node/7296490
vendor-advisorypatch

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This vulnerability was reported to IBM by Wolfgang Kriesel.
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