CVE-2026-30870

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{"affected": [{"affectedData": [{"product": "powersync-service", "vendor": "powersync-ja", "versions": [{"status": "affected", "version": "< 1.20.1"}]}, {"product": "service-core", "vendor": "@powersync", "versions": [{"status": "affected", "version": "< 1.20.1"}]}, {"product": "service-sync-rules", "vendor": "@powersync", "versions": [{"status": "affected", "version": "< 0.33.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}], "id": "CVE-2026-30870", "lastModified": "2026-06-17T10:33:03.807", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-30870", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-10T14:14:10.547827Z", "version": "2.0.3"}}]}, "published": "2026-03-10T17:40:14.530", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/powersync-ja/powersync-service/security/advisories/GHSA-q6wc-xx4m-92fj"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-285"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.20.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "powersync-service", "source": "cna", "vendor": "powersync-ja"}, "product": "powersync-service", "vendor": "powersync-ja"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.33.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "service-sync-rules", "source": "cna", "vendor": "@powersync"}, "product": "powersync-service-sync-rules", "vendor": "powersync-ja"}], "analysis": {"en": {"generated_at": "2026-04-16T10:02:47.317234+00:00", "value": {"mitigation_remediation": ["Upgrade PowerSync Service to version 1.20.1 or later to apply the vendor fix.", "Review and modify any existing config.edition:3 sync streams to ensure that subquery filters are not ignored, for example by partitioning the result set or removing the affected subqueries.", "Audit current sync stream configurations to confirm that no unauthorized data paths remain, and enforce least privilege for data synchronization.", "Monitor logs for any unauthorized sync activity and verify that discrepancies are addressed promptly."], "summary": {"action": "Patch", "impact": "Unauthorized data exposure"}, "threat_synthesis": {"affected_systems": "Affected components include @powersync:service-core, @powersync:service-sync-rules, and powersync-ja:powersync-service. The vulnerability exists only in version 1.20.0 and is fixed in 1.20.1. No other versions were reported to be affected.", "description_and_impact": "In PowerSync Service version 1.20.0, the sync engine incorrectly ignores certain subquery filters when a sync stream is configured with config.edition:3. This flaw allows an authenticated user to receive data that should have been excluded by those filters, effectively bypassing intended data access controls. The consequence is that sensitive data can be exposed to unintended users, violating confidentiality.", "risk_and_exploitability": "The CVSS base score is 6.5, indicating a medium severity vulnerability that directly impacts the confidentiality of user data. EPSS indicates a very low exploitation probability (<1%). The flaw is not listed in CISA's KEV catalog and no specific exploitation tools are publicly known. The most likely attack vector requires the attacker to have legitimate credentials and to configure or modify a sync stream with config.edition:3 that includes unpartitioned subqueries. Once the vector is enabled, the attacker can trigger the sync and retrieve data beyond their authorized scope."}}}}, "created": "2026-03-10T14:06:32.234762+00:00", "updated": "2026-04-16T10:15:26.102423+00:00", "vendors": ["powersync-ja", "powersync-ja$PRODUCT$powersync-service", "powersync-ja$PRODUCT$powersync-service-sync-rules"]}