SecuriTricks - 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.

Product(s) Impacted

Vendor	Product	Versions
Powersync	Powersync Service	1.20.0, <1.20.1

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-285

Improper Authorization

The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	powersync	powersync_service	1.20.0	/	/	/	/	/	/	/
a	powersync	powersync_service	<1.20.1	/	/	/	/	/	/	/

References

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

CVSS Score

6.5 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: LOW
Scope: UNCHANGED
Confidentiality Impact: HIGH
Integrity Impact: NONE
Availability Impact: NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

View Vector String

Timeline

Published: March 10, 2026, 5:40 p.m.
Last Modified: March 11, 2026, 1:53 p.m.

Status : Awaiting Analysis

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

CVE-2026-30870