VulnerabilityDeferred

CVE-2026-30870

This vulnerability is fixed in 1.20.1.

MEDIUM 6.5EPSS 0.20%

Does this matter?

Lower severity and a low EPSS score (0.20%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS: 0.20% probability · 10th percentile
CISA KEV: Not listed
Weakness: CWE-285
Source: security-advisories@github.com

References

https://github.com/powersync-ja/powersync-service/security/advisories/GHSA-q6wc-xx4m-92fj

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.