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CVE-2026-121419SurrealDB 3.1.0 before 3.3.0 MCP Session Hijack via BoundSubject Collision
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.
8.6 HIGHEPSS 0.31%Not in KEVNVD: Deferred
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 8.6 | HIGH | 4.0VulnCheck (CNA) | 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 |
| 8.1 | HIGH | 3.1VulnCheck (CNA) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
Details
- CVE ID
- CVE-2026-121419
- Status
- Deferred
- Assigner (CNA)
- VulnCheck
- Published
- Nov 3, 2026
- Last modified
- 2026-11-03 15:17 UTC
- Weaknesses
- CWE-269 · Improper Privilege Management
Affected Products
As published by the CNA in the CVE record.
surrealdbsurrealdb1 version range
- 3.1.0 before 3.3.0