CVE-2026-11918

{"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. 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.</div><div>IBM strongly recommends upgrading to v1.0.5 or higher, which replaces the top-level-only scan loops with a recursive walker in both plugins.</div></div>"}]}], "solutions": [{"lang": "en", "value": "| Product | Affected Version(s) | Fix Version | Instructions |\n\n|---|---|---|---|\n\n| | <=1.0.4 | 1.0.5 | Upgrade to v1.0.5 or later.\u00a0. |\n\n\n\n\n\nIBM strongly recommends addressing the vulnerability now.\n\nProduct(s)Version(s) number and/or range\u00a0Remediation/Fix/InstructionsIBM ContextForge MCP Gateway<=1.0.4\n\nv1.0.5 or later\n\n\n\nSee [release notes]( https://github.com/IBM/mcp-context-forge/releases/tag/v1.0.5) https://github.com/IBM/mcp-context-forge/releases/tag/v1.0.5%29 \n\n\n\n\n\n\u00a0Note: <Component A / B names> are bundled with <Product profile name> to provide <feature / function description>", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<div><br/><div>| Product | Affected Version(s) | Fix Version | Instructions |</div><div>|---|---|---|---|</div><div>| | &lt;=1.0.4 | 1.0.5 | Upgrade to v1.0.5 or later.\u00a0. |</div></div><p><strong>IBM strongly recommends addressing the vulnerability now.</strong></p><div><table><tbody><tr><td><strong>Product(s)</strong></td><td><strong>Version(s) number and/or range\u00a0</strong></td><td><strong>Remediation/Fix/Instructions</strong></td></tr><tr><td>IBM ContextForge MCP Gateway</td><td>&lt;=1.0.4</td><td><p>v1.0.5 or later</p><p>See [release notes](<a href=\"https://github.com/IBM/mcp-context-forge/releases/tag/v1.0.5%29\" rel=\"nofollow\">https://github.com/IBM/mcp-context-forge/releases/tag/v1.0.5)</a></p></td></tr></tbody></table></div><p>\u00a0Note: &lt;Component A / B names&gt; are bundled with &lt;Product profile name&gt; to provide &lt;feature / function description&gt;</p><p></p>"}]}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-11918", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-20T00:34:58.389670Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-20T00:45:43.821Z"}}]}}

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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", "value": "<div><div>There is no workaround that fully prevents the bypass while keeping the affected plugins active. 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