{"id":"CVE-2026-79786","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-79786","summary":"Coroot's unauthenticated MCP OAuth dynamic client registration endpoint accepts any syntactically valid redirect URI without validation, allowing attackers to register clients pointing…","details":"Coroot's unauthenticated MCP OAuth dynamic client registration endpoint accepts any syntactically valid redirect URI without validation, allowing attackers to register clients pointing to attacker-controlled hosts. Attackers can send authorization URLs to signed-in users, capture their authorization codes upon consent approval, and exchange them for access tokens to hijack MCP sessions.","published":"2026-08-25T19:16:54.750","modified":"2026-08-25T19:16:54.750","cvss":{"score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://github.com/coroot/coroot"},{"type":"WEB","url":"https://github.com/coroot/coroot/blob/v1.24.5/api/mcp_oauth.go"},{"type":"WEB","url":"https://github.com/coroot/coroot/issues/929"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/coroot-1.20.2-through-1.24.5-unvalidated-redirect-uri-in-mcp-oauth-client-registration"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-25T19:16:54.750"}}