CVE-2026-47388
NocoDB: Missing Ownership Check in MCP Attachment Read
Description
### Summary A low-privilege MCP token holder with knowledge of an attachment path could read any file in shared storage, including attachments belonging to other bases and workspaces, because the MCP `readAttachment` tool did not verify the file's ownership. ### Details The MCP `readAttachment` tool accepts caller-supplied `path`/`url` values and streams the file via the storage adapter. The handler now looks up the path in `nc_file_references` and requires a non-deleted row whose `base_id` matches the caller's MCP context before streaming; otherwise it returns `Attachment is not accessible from this MCP context`. The lookup tolerates both `download/uploads/...` and `uploads/...` styles. ### Impact Arbitrary read against shared storage scoped to attachments the caller's MCP context should not see. Exploitation requires an MCP token and a known attachment path. ### Credit This issue was reported by [@helwor-01](https://github.com/helwor-01).
How to fix CVE-2026-47388
To remediate CVE-2026-47388, upgrade the affected package to a fixed version below.
- —upgrade to 2026.05.1 or later
Is CVE-2026-47388 being exploited?
No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-47388.
Affected packages (1)
- from 0, < 2026.05.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N |