IBM ContextForge MCP Gateway is affected by security filter bypass via nested payload structures (CVE-2026-11918) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-11918

IBM ContextForge MCP Gateway is affected by security filter bypass via nested payload structures

Answer in brief

CVE-2026-11918 records a Unknown severity vulnerability in IBM ContextForge MCP Gateway is affected by security filter bypass via nested payload structures. The current sources do not mark it as known exploited. The current feed maps IBM/ContextForge MCP Gateway (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 15, 2026Updated Sep 15, 2026Source checked Sep 15, 2026First seen by HOL Sep 15, 2026Material review Sep 15, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps IBM/ContextForge MCP Gateway (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
IBM/ContextForge MCP Gatewaygeneric	<= v1.0.4	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for IBM/ContextForge MCP Gateway.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 15, 2026

Sources and claim methodology

Source referenceibm.com

Upstream source description

IBM ContextForge MCP Gateway <= v1.0.4 IBM mcp-context-forge could allow an authenticated user to bypass protection mechanisms due to incomplete recursive inspection of nested payload content.

Quoted source text, attributed separately from HOL analysis.