Privilege escalation in Surrealdb
CVE-2026-121419
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.
Vulnerability class: Privilege Escalation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/surrealdb/surrealdb/security/advisories/GHSA-pgh9-49q4-hqcx (vendor-advisory)
- www.vulncheck.com/advisories/surrealdb-3.1.0-before-3.3.0-mcp-session-hijack-vi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-121419?
- CVE-2026-121419 is a high-severity vulnerability in Surrealdb, classified under Improper Privilege Management. CVSS score: 8.1/10. Published 2026-11-03.
- How severe is CVE-2026-121419?
- High severity. CVSS v3 base score is 8.1 out of 10.