{"id":"CVE-2026-58446","summary":"Presenton \u003c 0.8.8-beta - Authentication Bypass of Session Auth via Unprotected MCP Endpoint","details":"Presenton before 0.8.8-beta bundles an MCP server that, on server/Docker deployments configured with session authentication (AUTH_USERNAME/AUTH_PASSWORD), is reachable unauthenticated at /mcp because the nginx front-end does not apply the auth_request gate to that path and the MCP server auto-mints a valid internal session token for the configured user. A remote unauthenticated attacker can invoke MCP tools such as generate_presentation, performing authenticated application actions, consuming the operators configured LLM API keys, and creating presentations in the operators instance. The Electron desktop build is not affected (MCP disabled).","modified":"2026-07-16T03:31:02.713724508Z","published":"2026-06-30T21:05:15.949Z","database_specific":{"cwe_ids":["CWE-306"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58446.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58446.json"},{"type":"ADVISORY","url":"https://github.com/presenton/presenton/releases/tag/electron-v0.8.8-beta"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58446"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/presenton-beta-authentication-bypass-of-session-auth-via-unprotected-mcp-endpoint"},{"type":"REPORT","url":"https://github.com/presenton/presenton/pull/679"},{"type":"FIX","url":"https://github.com/presenton/presenton/commit/a1103dcef3c761cc8bab44e2862c81a49969abd7"},{"type":"PACKAGE","url":"https://github.com/presenton/presenton"},{"type":"EVIDENCE","url":"https://github.com/presenton/presenton/issues/678"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/presenton/presenton","events":[{"introduced":"0"},{"fixed":"c1cdd7b8d0c922621e65094aaaebde4fbeb89095"},{"fixed":"a1103dcef3c761cc8bab44e2862c81a49969abd7"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"0.8.8-beta"}],"source":["DESCRIPTION","REFERENCES"]}}],"versions":["v0.8.8-beta","electron-v0.8.6-beta","v0.8.6-beta","v0.8.4-beta","v0.8.5-beta","v0.8.3-beta","v0.8.2-beta","v0.8.1-beta","v0.8.0-beta","v0.7.3-beta","electron-v0.7.3-beta","electron-v0.7.2-beta","electron-v0.7.1-beta","electron-v0.7.0-beta","electron-v0.6.3-beta","electron-v0.6.2-beta","electron-v0.6.0-beta","v0.5.18-beta","v0.5.17-beta","v0.5.16-beta","v0.5.15-beta","v0.5.14-beta","v0.5.12-beta","v0.5.11-beta","0.5.10","v0.5.9-beta","v0.5.8-beta","v0.5.7-beta","v0.5.6-beta","v0.5.5","v0.5.4-beta","v0.5.3-beta","v0.5.2-beta","v0.5.1-beta","v0.5.0-beta","v0.4.8-beta","v0.4.7-beta","v0.4.5-beta","v0.4.4-beta","v0.4.3-beta","v0.4.1-beta","v0.4.0-beta","v0.3.7-beta","v0.3.6-beta","v0.3.5-beta","v0.3.4-beta","v0.3.2-beta","v0.3.0-beta","v0.2.1-beta","v0.2.0-beta","v0.1.0-beta"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58446.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"}]}