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CVE-2026-73307 is a server-side request forgery vulnerability in Budibase affecting versions prior to 3.39.4. The flaw is in the AI table-generation workflow, where string attachment values processed by processAttachments in the workspace AI helper path are passed to uploadUrl in the server file utility path. In vulnerable versions, uploadUrl performs a bare server-side fetch for attacker-controlled URL strings instead of using the platform's blacklist-protected request validation. As a result, a builder-level user can supply an attachment reference that causes the Budibase server to issue requests to internal network services or cloud metadata endpoints, and the fetched response is then stored as an attachment. The issue was fixed in version 3.39.4.
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