{"id":"CVE-2026-11918","state":"PUBLISHED","title":"IBM ContextForge MCP Gateway is affected by security filter bypass via nested payload structures","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.","publishedAt":"2026-09-15T17:28:57.954Z","updatedAt":"2026-09-20T00:45:43.821Z","severity":{"score":5.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","source":"ibm"},"assigner":"ibm","products":["IBM ContextForge MCP Gateway"],"affected":[{"vendor":"IBM","product":"ContextForge MCP Gateway","versions":[{"version":"<= v1.0.4","status":"affected"}],"cpes":["cpe:2.3:a:ibm:contextforge_mcp_gateway:*:*:*:*:*:*:*:*"]}],"references":["https://www.ibm.com/support/pages/node/7285720"],"weaknesses":["CWE-184"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/11xxx/CVE-2026-11918.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-11918","state":"PUBLISHED","datePublished":"2026-09-15T17:28:57.954Z","dateUpdated":"2026-09-20T00:45:43.821Z","assignerShortName":"ibm","assignerOrgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","dateReserved":"2026-06-10T17:00:06.831Z"},"containers":{"cna":{"title":"IBM ContextForge MCP Gateway is affected by security filter bypass via nested payload structures","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."}],"affected":[{"vendor":"IBM","product":"ContextForge MCP Gateway","versions":[{"version":"<= v1.0.4","status":"affected"}],"cpes":["cpe:2.3:a:ibm:contextforge_mcp_gateway:*:*:*:*:*:*:*:*"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-184","lang":"en","description":"CWE-184 Incomplete List of Disallowed Inputs","type":"CWE"}]}],"providerMetadata":{"shortName":"ibm","orgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","dateUpdated":"2026-09-15T17:28:57.954Z"},"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. . |\n\n\n\n\n\nIBM strongly recommends addressing the vulnerability now.\n\nProduct(s)Version(s) number and/or range Remediation/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 Note: <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. . |</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 </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> Note: &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":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-20T00:45:43.821Z"}}]}}}