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    CVE-2026-30870

    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.

    Published:Mar 9, 2026
    Last Modified:Apr 16, 2026
    EPS:Mar 9, 2026
    EPSS Score:0.00036
    CVSS Score:6.5

    Affected Products

    Vendor
    Powersync-ja
    Product
    Powersync-service
    Vendor
    Powersync-ja
    Product
    Powersync-service-sync-rules

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-285 Improper Authorization

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High