CVE-2026-30870
MEDIUM
GHSA-q6wc-xx4m-92fj
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
3Description
PowerSync Service is the server-side component of the PowerSync sync engine. In version 1.20.0, when using new sync streams with config.edition: 3, certain subquery filters were ignored when determining which data to sync to users. Depending on the sync stream configuration, this could result in authenticated users syncing data that should have been restricted. Only queries that gate synchronization using subqueries without partitioning the result set are affected. This vulnerability is fixed in 1.20.1.
Analysis
PowerSync Service 1.20.0 with config.edition: 3 fails to enforce subquery filters in sync streams, allowing authenticated users to access data that should be restricted based on their permissions. The vulnerability affects only configurations using unpartitioned subqueries for synchronization gating and is resolved in version 1.20.1. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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External POC / Exploit Code
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