Replay Attack Vulnerability in IBM ContextForge MCP Gateway
CVE-2026-110278

7.4HIGH

Key Information:

Vendor

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

What is CVE-2026-110278?

The IBM ContextForge MCP Gateway versions 1.0.0 to 1.1.0 are exposed to a vulnerability that allows attackers to exploit static signature payloads. This could lead to the replay of identity propagation claims signatures, potentially enabling unauthorized access to sensitive user identity information. The lack of necessary per-gateway configuration checks during tool invocation exacerbates the risk, allowing third-party MCP servers to receive this sensitive data without adequate protection.

Affected Version(s)

ContextForge MCP Gateway 1.0.0 <= 1.1.0

References

https://www.ibm.com/support/pages/node/7296489
vendor-advisorypatch

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This vulnerability was reported to IBM by Wolfgang Kriesel.
.