Executive brief
APITable is an open-source low-code platform for building collaborative applications. The Fusion API authentication mechanism contains a flaw where permission checks silently fail when exceptions occur, allowing attackers with valid API tokens to write data to private datasheets they should not have access to. This could result in unauthorized data modification and exposure of confidential information.
Technical details
The vulnerability is an incorrect authorization flaw in the NodePermissionGuard middleware that fails to enforce node-level access control when permission lookups throw exceptions. The guard's matchPermissions method catches all exceptions from the NodePermissionService.getNodeRole() call and silently suppresses them with an empty catch block, causing the guard to return true (allow access) regardless of whether the permission check succeeded or failed. Attackers with valid Fusion API tokens can exploit this by triggering exceptions during permission lookups to bypass access controls and write attachments to private datasheets they have been explicitly denied access to. The vulnerability is network-accessible via the Fusion API endpoint and requires only a valid API token. A patch addressing the exception handling logic is available.
Affected products
- APITable APITable through 1.13.0-beta.1
Timeline
- 2026-09-05: disclosed