CVE-2026-110195

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IBM ContextForge MCP Gateway Token Cache Authorization Bypass

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: IBM Corporation

Description

IBM ContextForge MCP Gateway 1.0.0 through 1.0.11 could allow an authenticated caller to bypass upstream credential-level authorization policies due to an insufficiently specific cache key in the RFC 8693 token exchange cache, enabling reuse of cached upstream bearer tokens across different credentials belonging to the same user.

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Meta Information

Published

2026-11-13

Last Modified

2026-11-13

Generated

2026-11-14

AI Q&A

2026-11-14

EPSS Evaluated

N/A

NVD

CVE-2026-110195

Affected Vendors & Products

Vendor	Product	Version / Range
IBM	ContextForge MCP Gateway	From 1.0.0 (inc) to 1.0.11 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-287	When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Attack-Flow Graph

Executive Summary

IBM ContextForge MCP Gateway 1.0.0 through 1.0.11 has a flaw where an authenticated user can bypass credential-level authorization policies. This happens because the cache key used in the RFC 8693 token exchange is not specific enough, allowing cached upstream bearer tokens to be reused across different credentials for the same user.

Impact Analysis

An attacker with authenticated access could exploit this to perform actions on behalf of other users by reusing cached tokens. This may lead to unauthorized access to sensitive data or functions, depending on the permissions of the affected credentials.

Compliance Impact

This vulnerability could violate compliance requirements by allowing unauthorized access to protected data, potentially breaching GDPR's data protection principles or HIPAA's access controls. Organizations using this software may face regulatory penalties or audit failures.

Mitigation Strategies

Update IBM ContextForge MCP Gateway to the latest version to address the cache key issue. Review and restrict user credential permissions to minimize potential impact. Monitor token exchange logs for unusual activity or unauthorized access attempts.

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