TI-2026-84301 Aliases CVE-2026-121419 GHSA-hprh-85vv-3jpq

MCP session hijack in SurrealDB via shared BoundSubject fingerprint

LOW 37CWE-269Published 2026-11-03 · Updated 2026-11-03

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Privilege escalation
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-269.

Summary

SurrealDB from 3.1.0 before 3.3.0 uses the access method name instead of per-user identity to bind MCP sessions for JWT and Bearer access, an improper privilege management flaw (CWE-269). An attacker with a valid low-privilege token for the same access method who obtains a victim's mcp-session-id can hijack the session and run MCP tools with the victim's roles and permissions.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Description from the CNA

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.

Why it matters now

EPSS 0.00319 25th percentileScored 2026-11-07

Fix Fixed surrealdb (surrealdb): 3.3.0

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
surrealdb	surrealdb	3.1.0 to before 3.3.0	3.3.0	Patch available	CNA

surrealdb Vendorsurrealdb Affected 3.1.0 to before 3.3.0 Fixed in 3.3.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:surrealdb:surrealdb::::::::	—	—	surrealdb

cpe:2.3:a:surrealdb:surrealdb:*:*:*:*:*:*:*:* Versions — — ·surrealdb

Remediation

Upgrade SurrealDB to version 3.3.0, which fixes the flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Fix · CNA surrealdb (surrealdb) Fixed in 3.3.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-11-03
surrealdb 3.3.0
7 records Highest priority Priority MEDIUM 2 MEDIUM, 5 LOW
Other records, highest priority first
- TI-2026-84300 SurrealDB index planner lets users infer restricted fieldsPriority MEDIUM 57
- TI-2026-84304 Server-side request forgery in SurrealDB via JWKS URL default portsPriority MEDIUM 56
- TI-2026-84299 Use-after-free in SurrealDB KV backends via affinitypool spawn_localPriority LOW 37
Show all 7 records →

Timeline

2026-11-03 Threatist record created from CVE-2026-121419
2026-11-03 Alias added: GHSA-hprh-85vv-3jpq
2026-11-05 Priority changed: MEDIUM → LOW

References

Advisory 1

GitHub Security Advisory (GHSA-pgh9-49q4-hqcx)

TI-2026-84300 SurrealDB index planner lets users infer restricted fields CVSS 4.0MEDIUM 5.3
TI-2026-84304 Server-side request forgery in SurrealDB via JWKS URL default ports CVSS 4.0MEDIUM 5.1
TI-2026-45344 SurrealDB before 3.1.0 Session Hijacking via /rpc sessions CVSS 4.0HIGH 8.7
TI-2024-38452 SurrealDB before 1.1.0 Denial of Service via HTTP Headers CVSS 4.0HIGH 8.7
TI-2026-45347 SurrealDB before 3.1.0 Denial of Service via JSON Parser CVSS 4.0HIGH 8.7
TI-2026-45334 SurrealDB before 3.1.0 Denial of Service via malformed RPC use CVSS 4.0HIGH 8.7

See all 76 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences