CVE-2026-93328 PUBLISHED

Missing Authorization in MCP Toolbox for Databases allows Arbitrary File Read and Write

Assigner: GoogleCloud
Reserved: 17.09.2026 Published: 26.10.2026 Updated: 26.10.2026

Path Traversal and Missing Authorization in cloud-storage source in Google Cloud MCP Toolbox for Databases (googleapis/mcp-toolbox) versions 1.2.0 through 1.4.0 allows an unauthenticated remote attacker to exfiltrate host files to external Google Cloud Storage buckets and overwrite arbitrary local files via crafted tool invocation parameters.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/U:Amber
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	Low
Attack Complexity	Low	Integrity	High	Integrity	Low
Attack Requirements	None	Availability	High	Availability	Low
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Google Cloud
Product	MCP Toolbox for Databases (googleapis/mcp-toolbox)
Versions	Default: unaffected affected from 1.2.0 to 1.5.0 (excl.)

Solutions

Upgrade googleapis/mcp-toolbox to version 1.5.0 or later.

Configure the security boundaries introduced in v1.5.0 by setting allowedLocalRoots to restrict host file system interactions strictly to designated, isolated directories set allowedBuckets to ensure the tool only reads from and writes to explicit, authorized Google Cloud Storage buckets.

Follow the Principle of Least Privilege by running the Toolbox service under an unprivileged OS user account and restricting associated Google Cloud IAM permissions.

Credits

He Wei (gikaku) reporter

References

https://github.com/googleapis/mcp-toolbox/pull/3454

Problem Types

CWE-862 Missing Authorization CWE
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') CWE

Impacts

CAPEC-126 Path Traversal