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6.5
PowerSync Service: Users may sync restricted data unintentionally
GHSA-q6wc-xx4m-92fj
CVE-2026-30870
Summary
PowerSync Service in version 1.20.0 allows authenticated users to access data they shouldn't. This is due to a bug in the data syncing process. Make sure to update to version 1.20.1 to fix the issue.
What to do
- Update powersync service-core to version 1.20.1.
- Update powersync service-sync-rules to version 0.33.0.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| powersync | service-core | <= 1.20.0 | 1.20.1 |
| powersync | service-sync-rules | <= 0.32.0 | 0.33.0 |
Original title
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 determ...
Original 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.
ghsa CVSS3.1
6.5
Vulnerability type
CWE-285
Improper Authorization
Published: 10 Mar 2026 · Updated: 13 Mar 2026 · First seen: 7 Mar 2026