{"schemaVersion":3,"id":"CVE-2026-53711","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"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.","dates":{"published":"2026-10-13T14:34:01.069Z","modified":"2026-10-13T15:48:27.245Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.1,"severity":"medium","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"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","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":5.1,"severity":"medium","vector":"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","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":5.1,"severity":"medium","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00363,"percentile":0.28842,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-14T00:00:00.000Z","score":0.00363,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00363,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00363,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00363,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00363,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00363,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00363,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00363,"percentile":0.28842}],"last30":[{"date":"2026-10-14T00:00:00.000Z","score":0.00363,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00363,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00363,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00363,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00363,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00363,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00363,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00363,"percentile":0.28842}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","description":"The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/79.html"}],"affected":[{"vendor":"ibm","product":"mcp-context-forge","name":"mcp-context-forge","label":"mcp-context-forge","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 0.2.0, < 0.3.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 0.2.0, < 0.3.1","eol":null,"hubHref":"/vendor/ibm/mcp-context-forge"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/IBM/mcp-context-forge/security/advisories/GHSA-x6gc-rm5j-55mw","label":"github.com/IBM/mcp-context-forge/security/advisories/GHSA-x6gc-rm5j-55mw","hostname":"github.com","tags":["X Refsource CONFIRM"]},{"url":"https://github.com/IBM/mcp-context-forge/pull/337","label":"github.com/IBM/mcp-context-forge/pull/337","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/IBM/mcp-context-forge/commit/acd16196158f9a393187551b21a2fc61650f2e3d","label":"github.com/IBM/mcp-context-forge/commit/acd16196158f9a393187551b21a2fc61650f2e3d","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/IBM/mcp-context-forge/releases/tag/v0.3.1","label":"github.com/IBM/mcp-context-forge/releases/tag/v0.3.1","hostname":"github.com","tags":["X Refsource MISC"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-13T14:34:01.069Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-13T15:48:27.245Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":20,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T02:11:34.065Z","stale":false,"partial":false}}