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.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

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

Configurations

No configuration.

History

No history.

Information

Published : 2026-03-10 17:40

Updated : 2026-03-11 13:53

NVD link : CVE-2026-30870

Mitre link : CVE-2026-30870

CVE.ORG link : CVE-2026-30870

JSON object : View

Products Affected

No product.

CWE

CWE-285

Improper Authorization

{"id": "CVE-2026-30870", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "published": "2026-03-10T17:40:14.530", "references": [{"url": "https://github.com/powersync-ja/powersync-service/security/advisories/GHSA-q6wc-xx4m-92fj", "source": "security-advisories@github.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-285"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "PowerSync Service es el componente del lado del servidor del motor de sincronizaci\u00f3n PowerSync. En la versi\u00f3n 1.20.0, al usar nuevas transmisiones de sincronizaci\u00f3n con config.edition: 3, ciertos filtros de subconsulta fueron ignorados al determinar qu\u00e9 datos sincronizar con los usuarios. Dependiendo de la configuraci\u00f3n de la transmisi\u00f3n de sincronizaci\u00f3n, esto podr\u00eda resultar en que usuarios autenticados sincronicen datos que deber\u00edan haber sido restringidos. Solo las consultas que controlan la sincronizaci\u00f3n usando subconsultas sin particionar el conjunto de resultados se ven afectadas. Esta vulnerabilidad est\u00e1 corregida en la 1.20.1."}], "lastModified": "2026-03-11T13:53:47.157", "sourceIdentifier": "security-advisories@github.com"}