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CVE-2026-11918

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

MEDIUM
5.4
CVSS Score
Published: September 15, 2026 at 05:28 PM UTC
Updated: September 20, 2026 at 01:16 AM UTC
1 product affected across 1 vendorContextforge

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Contextforge· IBMpypi
60%
v ≤ 1.0.4

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://www.ibm.com/support/pages/node/7285720

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUMibm
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-184

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