{"id":"CVE-2026-79537","published":"2026-09-29T20:17:27.383","lastModified":"2026-09-29T20:17:27.383","description":"metatool-ai MetaMCP through 2.4.22 contains an insecure direct object reference (IDOR) in the MCP transport session dispatch. The session store (getSession in session-lifetime-manager.ts) is keyed only by the client-supplied mcp-session-id header with no owner, namespace, or endpoint binding, and the per-endpoint authorization middleware validates only the URL endpoint's owner, never the session. An attacker who supplies another tenant's session id \" obtained without authentication from GET /metamcp/health/sessions, which discloses active session IDs and namespace UUIDs \" can list and execute the victim tenant's private MCP tools and exfiltrate their data using the victim's forwarded credentials.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://github.com/metatool-ai/metamcp","tags":[]},{"url":"https://www.traceforce.ai/security-advisories/cve-2026-79537","tags":[]}],"exploitRefs":[{"url":"https://github.com/metatool-ai/metamcp","tags":[]}],"hasPoc":true,"ai":null}