AIKIDO-2026-11107
parse-server is vulnerable to Authorization Bypass
69
Medium Risk
This Affects:
parse-serverTL;DR
Parse Server's database controller resolves relation queries that use the $relatedTo operator. Such queries could read the membership of a Relation field even when that field was hidden from the client by protectedFields, and they bypassed the owning object's ACL and class-level permissions. An unauthenticated client that knew an object's ID could enumerate linked objects or confirm specific relationships, acting as a membership oracle for objects it could not otherwise read. The fix adds an authorization check that denies $relatedTo queries on protected relation fields and verifies the caller can read the owning object before returning related objects.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
parse-server is vulnerable to Authorization Bypass in versions 0.0.1 - 8.6.79 and 9.0.0 - 9.9.1-alpha.5.
How to fix this
Upgrade the parse-server library to the patch version.
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