---
id: CVE-2026-121419
title: SurrealDB 3.1.0 before 3.3.0 MCP Session Hijack via BoundSubject Collision
summary: >-
  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-privile…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-269
vendor: surrealdb
product: surrealdb
affected:
  - surrealdb >= 3.1.0 < 3.3.0
published: '2026-11-03'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T14:28:16.612Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121419'
references:
  - url: >-
      https://github.com/surrealdb/surrealdb/security/advisories/GHSA-pgh9-49q4-hqcx
    label: GitHub Security Advisory (GHSA-pgh9-49q4-hqcx)
  - url: >-
      https://www.vulncheck.com/advisories/surrealdb-3.1.0-before-3.3.0-mcp-session-hijack-via-boundsubject-collision
    label: >-
      VulnCheck Advisory: SurrealDB 3.1.0 before 3.3.0 MCP Session Hijack via
      BoundSubject Collision
tags:
  - cve.org
epss: 0.00319
epssPercentile: 0.24986
ingestedAt: '2026-11-05T19:30:42.967Z'
---

## Overview

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.

## Affected

- `surrealdb >= 3.1.0 < 3.3.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.