{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-11918", "assignerOrgId": "9a959283-ebb5-44b6-b705-dcc2bbced522", "state": "PUBLISHED", "assignerShortName": "ibm", "dateReserved": "2026-06-10T17:00:06.831Z", "datePublished": "2026-09-15T17:28:57.954Z", "dateUpdated": "2026-09-20T00:45:43.821Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "9a959283-ebb5-44b6-b705-dcc2bbced522", "shortName": "ibm", "dateUpdated": "2026-09-15T17:28:57.954Z"}, "title": "IBM ContextForge MCP Gateway is affected by security filter bypass via nested payload structures", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-184", "description": "CWE-184 Incomplete List of Disallowed Inputs", "type": "CWE"}]}], "affected": [{"vendor": "IBM", "product": "ContextForge MCP Gateway", "versions": [{"status": "affected", "version": "<= v1.0.4"}], "cpes": ["cpe:2.3:a:ibm:contextforge_mcp_gateway:*:*:*:*:*:*:*:*"]}], "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>IBM ContextForge MCP Gateway &lt;= 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.</p>"}]}], "references": [{"url": "https://www.ibm.com/support/pages/node/7285720", "tags": ["vendor-advisory", "patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE", "baseSeverity": "MEDIUM", "baseScore": 5.4, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"}}], "workarounds": [{"lang": "en", "value": "There is no workaround that fully prevents the bypass while keeping the affected plugins active. Operators may disable `regex_filter` and `deny_filter` in `plugins/config.yaml` to prevent exploitation, at the cost of losing the filtering controls those plugins provide.\n\nIBM strongly recommends upgrading to v1.0.5 or higher, which replaces the top-level-only scan loops with a recursive walker in both plugins.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<div><div>There is no workaround that fully prevents the bypass while keeping the affected plugins active. 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