CVE-2026-75850: ArcadeDB before 26.8.1 Per-Type ACL Bypass via Batch Handlers
ArcadeDB before 26.8.1 fails to bind the authenticated principal (setCurrentUser) on its batch and time-series HTTP handlers. Because no principal is bound on the worker thread, the engine's fine-grained per-type ACL layer (LocalBucket.checkPermissionsOnFile) does not execute for these handlers. In deployments that use per-type or per-group ACLs, a user with database access but only limited per-type permissions can read from and write to types they are not authorized to access by submitting requests to the batch/time-series endpoints. Deployments that rely solely on database-level access control are not affected.
Affected Software
Event History
Frequently Asked Questions
Which deployments are affected?
Deployments that enforce per-type or per-group ACLs are exposed. Deployments relying only on database-level access control are not affected.
What level of access does an attacker need?
An attacker needs database access and limited per-type permissions. They can then submit requests to the batch or time-series HTTP endpoints to read or write types that their per-type ACLs should deny.
What version resolves the issue?
Upgrade ArcadeDB to version 26.8.1 or later. The affected behavior applies to versions before 26.8.1.
How can I assess whether the issue may have been exploited?
Review use of the batch and time-series HTTP endpoints in deployments with per-type or per-group ACLs, especially for requests made by users whose type-level permissions are restricted. Such requests may have accessed types outside the user's intended authorization.