Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck

CVE-2026-121419SurrealDB 3.1.0 before 3.3.0 MCP Session Hijack via BoundSubject Collision

High 8.1

In plain English

A high-severity privilege mismanagement in surrealdb from surrealdb. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.3%top 75.0% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
surrealdb	surrealdb	3.1.0 – before 3.3.0

Weakness: CWE-269 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References

GitHub Security Advisory (GHSA-pgh9-49q4-hqcx) vendor-advisory
VulnCheck Advisory: SurrealDB 3.1.0 before 3.3.0 MCP Session Hijack via BoundSubject Collision third-party-advisory