{"id":"CVE-2026-121419","aliases":["EUVD-2026-115951","GHSA-hprh-85vv-3jpq","GHSA-pgh9-49q4-hqcx"],"status":"published","title":"SurrealDB 3.1.0 before 3.3.0 MCP Session Hijack via BoundSubject Collision","description":"SurrealDB from 3.1.0 before 3.3.0 contains an improper authentication vulnerability where the MCP BoundSubject fingerprint uses the access method name instead of per-user identity for JWT/Bearer access. Attackers with a valid low-privilege token for the same access method and a victim's mcp-session-id can hijack the session and execute MCP tools with the victim's roles and permissions.","severity":{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00319,"percentile":0.25208,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-269"],"published":"2026-11-03T14:28:16Z","modified":"2026-11-09T14:51:03Z","products":[{"vendor":"surrealdb","product":"surrealdb"}],"references":[{"url":"https://github.com/surrealdb/surrealdb/security/advisories/GHSA-pgh9-49q4-hqcx","tags":["vendor-advisory","exploit","advisory"]},{"url":"https://www.vulncheck.com/advisories/surrealdb-3.1.0-before-3.3.0-mcp-session-hijack-via-boundsubject-collision","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121419","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-hprh-85vv-3jpq"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121419.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-121419","title":"SurrealDB 3.1.0 before 3.3.0 MCP Session Hijack via BoundSubject Collision","description":"SurrealDB from 3.1.0 before 3.3.0 contains an improper authentication vulnerability where the MCP BoundSubject fingerprint uses the access method name instead of per-user identity for JWT/Bearer access. Attackers with a valid low-privilege token for the same access method and a victim's mcp-session-id can hijack the session and execute MCP tools with the victim's roles and permissions.","status":"published","published":"2026-11-03T14:28:16.612Z","modified":"2026-11-09T14:51:03.575Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-269"],"updated_at":"2026-11-09T15:33:44.265689Z"}],"euvd":[{"id":"EUVD-2026-115951","description":"SurrealDB from 3.1.0 before 3.3.0 contains an improper authentication vulnerability where the MCP BoundSubject fingerprint uses the access method name instead of per-user identity for JWT/Bearer access. Attackers with a valid low-privilege token for the same access method and a victim's mcp-session-id can hijack the session and execute MCP tools with the victim's roles and permissions.","status":"published","published":"2026-11-03T14:28:16Z","modified":"2026-11-09T14:51:03Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-09T16:17:22.482171Z"}],"ghsa":[{"id":"GHSA-hprh-85vv-3jpq","title":"SurrealDB from 3.1.0 before 3.3.0 contains an improper authentication vulnerability where the MCP...","description":"SurrealDB from 3.1.0 before 3.3.0 contains an improper authentication vulnerability where the MCP BoundSubject fingerprint uses the access method name instead of per-user identity for JWT/Bearer access. Attackers with a valid low-privilege token for the same access method and a victim's mcp-session-id can hijack the session and execute MCP tools with the victim's roles and permissions.","status":"published","published":"2026-11-03T15:32:11Z","modified":"2026-11-03T15:32:12Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high"},{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"cwes":["CWE-269"],"updated_at":"2026-11-03T15:57:23.404697Z"}],"nvd":[{"id":"CVE-2026-121419","description":"SurrealDB from 3.1.0 before 3.3.0 contains an improper authentication vulnerability where the MCP BoundSubject fingerprint uses the access method name instead of per-user identity for JWT/Bearer access. Attackers with a valid low-privilege token for the same access method and a victim's mcp-session-id can hijack the session and execute MCP tools with the victim's roles and permissions.","status":"published","published":"2026-11-03T15:17:31.953Z","modified":"2026-11-09T15:17:10.53Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-269"],"updated_at":"2026-11-09T18:15:13.699929Z"}],"osv":[{"id":"CVE-2026-121419","title":"SurrealDB 3.1.0 before 3.3.0 MCP Session Hijack via BoundSubject Collision","description":"SurrealDB from 3.1.0 before 3.3.0 contains an improper authentication vulnerability where the MCP BoundSubject fingerprint uses the access method name instead of per-user identity for JWT/Bearer access. Attackers with a valid low-privilege token for the same access method and a victim's mcp-session-id can hijack the session and execute MCP tools with the victim's roles and permissions.","status":"published","published":"2026-11-03T14:28:16.612Z","modified":"2026-11-11T02:30:35.908519681Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-269"],"updated_at":"2026-11-11T11:06:40.669625Z"}]}}