VU#382143: Lowcoder Query Library API contains cross-tenant authorization bypass allowing for data exfiltration

Publisher excerpt From CERT/CC Vulnerability Notes

Overview Lowcoder, version 2.4.10, contains an authorization bypass vulnerability in its Query Library feature’s API. Authenticated users with an admin or dev role can access private library-query data from other organizations within a multi-tenant Lowcoder instance. Description CVE-2026-16753 Lowcoder is an open-source low-code platform that allows individuals with minimal coding experience to build web applications through a visual drag-and-drop interface. Each Lowcoder project contains a centralized Query Library which stores the workspace’s data queries and sources for quick reuse; however, the LibraryQuery API service layer lacks organization-scope checks at two endpoints: metadata retrieval and query execution. While the application features a role-based access mechanism (requires admin or dev), it only checks the role’s validity against the user’s own organization. The vulnerable endpoints do not validate whether the requested resource belongs to the requester's organization. Impact Any authenticated attacker with an admin or dev role in any organization on a multi-tenant Lowcoder instance can access other tenants’ Query Libraries. Note that these roles are granted by default for any self-signup account when LOWCODER_EMAIL_SIGNUP_ENABLED and LOWCODER_CREATE_WORKSPACE_ON_SIGNUP are TRUE. This allows an attacker to do the following: Read the full Domain Specific Language (DSL) of any other organization’s library queries, including complete query configuration an…

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