{"id":"CVE-2026-53711","summary":"MCP ContextForge: Global Prompts stored cross-site scripting compromises the Admin UI","details":"MCP Context Forge provides an MCP Admin UI for managing gateway resources. From 0.2.0 until 0.3.1, the Global Prompts feature stores a prompt template without sufficient output encoding before the MCP Admin UI renders it. An authenticated attacker can save markup containing script-capable event handlers, and the code executes when another user views the saved prompt. The stored cross-site scripting can alter the interface, present phishing content, observe keystrokes available to the page, and act with the viewer's browser session. This issue is fixed in version 0.3.1.","aliases":["GHSA-x6gc-rm5j-55mw"],"modified":"2026-10-14T02:48:34.505824479Z","published":"2026-10-13T14:34:01.069Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53711.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53711.json"},{"type":"FIX","url":"https://github.com/IBM/mcp-context-forge/commit/acd16196158f9a393187551b21a2fc61650f2e3d"},{"type":"FIX","url":"https://github.com/IBM/mcp-context-forge/pull/337"},{"type":"WEB","url":"https://github.com/IBM/mcp-context-forge/releases/tag/v0.3.1"},{"type":"ADVISORY","url":"https://github.com/IBM/mcp-context-forge/security/advisories/GHSA-x6gc-rm5j-55mw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53711"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ibm/mcp-context-forge","events":[{"introduced":"c2fc4e9717eaf71a0041ec4f882a00e20aa3871d"},{"fixed":"528cb285890fb2d95ba3ee5c9321f3cfa2f6f7cf"}],"database_specific":{"extracted_events":[{"introduced":"0.2.0"},{"fixed":"0.3.1"}],"source":"AFFECTED_FIELD"}}],"versions":["v0.3.0","v0.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53711.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"}]}