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CVE-2026-30870— Some sync filters in PowerSync Service ignored using `config.edition: 3`

Quick assessment

Affected
powersync-ja powersync-service
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PowerSync Service是PowerSync开源的一个本地优先应用的同步引擎。 PowerSync Service 1.20.0版本存在授权问题漏洞，该漏洞源于使用新同步流时忽略某些子查询过滤器，可能导致经过身份验证的用户同步本应受限的数据。

CVSS 6.5 · Medium EPSS 0.35% · P27

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-30870

Vulnerability Information
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Vulnerability Title
Some sync filters in PowerSync Service ignored using `config.edition: 3`
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
PowerSync Service 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PowerSync Service是PowerSync开源的一个本地优先应用的同步引擎。 PowerSync Service 1.20.0版本存在授权问题漏洞，该漏洞源于使用新同步流时忽略某些子查询过滤器，可能导致经过身份验证的用户同步本应受限的数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
powersync-ja powersync-service < 1.20.1 -
@powersync service-core < 1.20.1 -
@powersync service-sync-rules < 0.33.0 -

II. Public POCs for CVE-2026-30870

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III. Intelligence Information for CVE-2026-30870

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Vendor Advisories for CVE-2026-30870 (1)

IV. Related Vulnerabilities

Same weakness: CWE-285

V. Comments for CVE-2026-30870

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