CVE-2026-11918Network attack vectorHinoki check available

Authenticated filter bypass via nested payload evasion

Published Sep 15, 2026 · Updated Sep 15, 2026

Protection bypass in IBM ContextForge MCP Gateway 1.0.4 and earlier allows remote authenticated users to evade content filtering. The gateway's payload security filter incompletely traverses nested content, allowing prohibited material deeper in a structured request to escape inspection. A valid authenticated session and crafted nested payload are required; the published information specifies no consequence beyond bypass of the intended protection.

CVSS severityUnavailable
Unscored
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Protection bypass in IBM ContextForge MCP Gateway 1.0.4 and earlier allows remote authenticated users to evade content filtering. The gateway's payload security filter incompletely traverses nested content, allowing prohibited material deeper in a structured request to escape inspection. A valid authenticated session and crafted nested payload are required; the published information specifies no consequence beyond bypass of the intended protection.

The record

CVE
CVE-2026-11918
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
IBM
Product
ContextForge MCP Gateway
Classifications
T1687
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= v1.0.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · ContextForge MCP Gatewayversion=<= v1.0.4

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1687Exploitation for Defense Impairment

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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