{"id":"CVE-2026-79786","summary":"Coroot 1.20.2 through 1.24.5 Unvalidated Redirect URI in MCP OAuth Client Registration","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.","modified":"2026-08-30T03:30:51.453429869Z","published":"2026-08-25T18:23:14.494Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-601"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/79xxx/CVE-2026-79786.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/79xxx/CVE-2026-79786.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-79786"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/coroot-1.20.2-through-1.24.5-unvalidated-redirect-uri-in-mcp-oauth-client-registration"},{"type":"REPORT","url":"https://github.com/coroot/coroot/issues/929"},{"type":"PACKAGE","url":"https://github.com/coroot/coroot"},{"type":"ARTICLE","url":"https://github.com/coroot/coroot/blob/v1.24.5/api/mcp_oauth.go"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/coroot/coroot","events":[{"introduced":"6f2da40b9bf4b795929f8ec3a6cfb1c31ccbc805"},{"last_affected":"04496b59f7fb1f0aa868ceecc9beeedc0bdc8a2b"}],"database_specific":{"extracted_events":[{"introduced":"1.20.2"},{"last_affected":"1.24.5"}],"source":"AFFECTED_FIELD"}}],"versions":["v1.24.5","v1.24.4","v1.24.3","v1.24.2","v1.24.1","v1.24.0","v1.23.3","v1.23.2","v1.23.1","v1.23.0","v1.22.2","v1.22.1","v1.22.0","v1.21.1","v1.21.0","v1.20.2","v1.20.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-79786.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N"}]}