Improper Authentication Vulnerability in SurrealDB by SurrealDB
CVE-2026-121419

8.6HIGH

Key Information:

Vendor

Surrealdb

Status
Surrealdb
Vendor
CVE Published:
3 November 2026

What is CVE-2026-121419?

SurrealDB versions 3.1.0 through 3.2.0 expose an improper authentication risk, allowing attackers to exploit the MCP BoundSubject fingerprint mechanism. This vulnerability permits an attacker with a low-privilege token and knowledge of a victim's mcp-session-id to hijack the session, executing MCP tools with the victim's permissions and roles. This highlights the critical need for enhanced authentication mechanisms to prevent unauthorized session access.

Affected Version(s)

surrealdb 3.1.0 < 3.3.0

surrealdb 3.3.0

References

https://github.com/surrealdb/surrealdb/security/advisorie...
vendor-advisory
https://www.vulncheck.com/advisories/surrealdb-3.1.0-befo...
third-party-advisory

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Yanhaoxi
.