Medium severity6.5NVD Advisory· Published Mar 10, 2026· Updated Apr 16, 2026

CVE-2026-30870

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.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
@powersync/service-corenpm	>= 1.20.0, < 1.20.1	1.20.1
@powersync/service-sync-rulesnpm	>= 0.32.0, < 0.33.0	0.33.0

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

github.com/advisories/GHSA-q6wc-xx4m-92fjghsaADVISORY
nvd.nist.gov/vuln/detail/CVE-2026-30870ghsaADVISORY
github.com/powersync-ja/powersync-service/security/advisories/GHSA-q6wc-xx4m-92fjnvdWEB

News mentions

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cvss	0.423
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exploit	0.000
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ransomware	0.000