{"id":"CVE-2026-100868","summary":"Penpot before 2.18.0 Unauthenticated WebSocket Access via MCP Bridge","details":"Penpot before 2.18.0 binds the MCP server plugin WebSocket bridge to all network interfaces without authentication in single-user mode. Unauthenticated attackers on adjacent networks can connect to the WebSocket port to impersonate the Penpot browser plugin, intercept task payloads, and return forged results to the MCP client.","modified":"2026-10-02T03:30:48.802305650Z","published":"2026-09-27T13:09:53.387Z","related":["GHSA-22qr-rp27-j9wm","GHSA-ch2q-6x56-qg5r"],"database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-1327"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100868.json"},"references":[{"type":"WEB","url":"https://www.npmjs.com"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100868.json"},{"type":"ADVISORY","url":"https://github.com/penpot/penpot/security/advisories/GHSA-22qr-rp27-j9wm"},{"type":"ADVISORY","url":"https://github.com/penpot/penpot/security/advisories/GHSA-ch2q-6x56-qg5r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100868"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/penpot-before-2.18.0-unauthenticated-websocket-access-via-mcp-bridge"},{"type":"FIX","url":"https://github.com/penpot/penpot/commit/b5274a44766d095247037be18c1d1918ac67ddeb"},{"type":"PACKAGE","url":"https://github.com/penpot/penpot"},{"type":"ARTICLE","url":"https://github.com/penpot/penpot/blob/1d2c37e52c733f74017d90b0fd1ae2d074a5c33d/mcp/packages/server/src/PluginBridge.ts#L52"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/penpot/penpot","events":[{"introduced":"0"},{"fixed":"5baffdc213f0deaaeb318e97a41d611ac0656a94"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.18.0"},{"last_affected":"2.15.4"}],"source":"AFFECTED_FIELD"}}],"versions":["2.18.0-RC7","2.18.0-RC6","2.18.0-RC4","2.18.0-RC3","2.18.0-RC2","2.17.1-RC5","2.18.0-RC1","2.17.1-RC4","2.17.1-RC3","2.17.1-RC2","2.17.1-RC1","2.17.0","2.17.0-RC6","2.17.0-RC5","2.17.0-RC4","2.17.0-RC3","2.17.0-RC1","2.16.1-RC2","2.16.0","2.16.0-RC13","2.16.0-RC11","2.16.0-RC9","2.16.0-RC8","2.16.0-RC7","2.16.0-RC6","2.16.0-RC5","2.16.0-RC4","2.16.0-RC3","2.16.0-RC2","2.16.0-RC1","2.15.0-RC1","2.14.0-RC4","2.14.0-RC3","2.14.0-RC2","2.14.0-RC1","2.10.0-RC1","2.7.0-RC1","2.6.0-RC1","2.5.0-RC1","2.5.0-DEV","pre-lazy-loading","1.14.1-beta","1.14.0-beta","1.9.0-alpha","1.8.2-alpha","1.8.1-alpha","1.8.0-alpha","1.7.4-alpha","1.7.3-alpha","1.7.2-alpha","1.7.1-alpha","1.7.0-alpha","1.6.5-alpha","1.6.4-alpha","1.6.3-alpha","1.6.2-alpha","1.6.1-alpha","1.6.0-alpha","1.5.4-alpha","1.5.3-alpha","1.5.2-alpha","1.5.1-alpha","1.5.0-alpha","1.4.1-alpha","1.4.0-alpha","1.4.0-dev","1.3.0-alpha","1.2.0-alpha","1.1.0-alpha","1.0.0-alpha","0.1.0","0.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100868.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N"}]}