CVE-2026-121419

High

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.

SeverityHigh

CVSS8.1

Exploit probability—

ProductSurrealdb

PublishedNov 3, 2026

First seenNov 4, 2026

Weakness typeCWE-269Improper privilege management

How to fix

Update

surrealdb surrealdb3.3.0 or later

Vendor advisories

github.com/surrealdb/surrealdb/security/advisories/GHSA-pgh9-49q4-hqcx

Affected products

Product	Affected versions	Fixed in
surrealdb surrealdb	3.1.0 ≤ v < 3.3.0	3.3.0

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