CVE-2026-30870
Medium
Description
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.
SeverityMedium
CVSS6.5
Exploit probability—
Product@powersync/service-core
PublishedMar 10, 2026
First seenMar 10, 2026
Weakness typeCWE-285CWE-285
How to fix
Update
- @powersync/service-core1.20.1 or later
- @powersync/service-sync-rules0.33.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| @powersync/service-corenpm | 1.20.0 ≤ v < 1.20.1 | 1.20.1 |
| @powersync/service-sync-rulesnpm | 0.32.0 ≤ v < 0.33.0 | 0.33.0 |
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