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CVE-2026-93328

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

Critical9.3EPSS 0.53%
Published
Updated
Reserved
Assigned by
GoogleCloud

Description

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.

Scores

CVSS scores of CVE-2026-93328, by who scored it
Scored byCVSSScoreVector
GoogleCloudCNA (assigner)4.0Critical9.3CVSS: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
NVDNVD · Awaiting Analysis4.0Critical9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber
EPSS (exploitation in 30 days)
0.53% · top 55% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.3.

Weakness

Affected products

What to do

Solution: 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.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .