CVE-2026-34600

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{"affected": [{"affectedData": [{"product": "joplin", "vendor": "laurent22", "versions": [{"status": "affected", "version": "< 3.5.3"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Versions 3.5.2 and prior contain a logic error in the delta API that allows share recipients to download notes that are no longer shared with them, related to but not fully fixed by the prior patch in #14289. In ChangeModel.delta, when DELTA_INCLUDES_ITEMS is enabled (the default), the latest state of items is attached to delta output without verifying that those items are still shared with the requesting user, and the existing removal logic only filters items deleted for all users. Additionally, the change compression logic incorrectly reduces create - delete to NOOP, which is unsafe because compression is applied per page and an item can have multiple create events; if an earlier create falls on a separate page from a later create -> delete pair, the deletion is dropped and the sequence collapses to a create. As a result, the delta API returns a create event for a deleted item with the full latest content attached, exposing notes the user no longer has access to. This issue has been fixed in version 3.5.3."}, {"lang": "es", "value": "Joplin es una aplicaci\u00f3n de toma de notas y de tareas pendientes de c\u00f3digo abierto que organiza notas y listas en cuadernos. Las versiones 3.5.2 y anteriores contienen un error de l\u00f3gica en la API delta que permite a los destinatarios de la compartici\u00f3n descargar notas que ya no est\u00e1n compartidas con ellos, relacionado con, pero no completamente solucionado por el parche anterior en el #14289. En ChangeModel.delta, cuando DELTA_INCLUDES_ITEMS est\u00e1 habilitado (el valor predeterminado), el estado m\u00e1s reciente de los elementos se adjunta a la salida delta sin verificar que esos elementos sigan compartidos con el usuario solicitante, y la l\u00f3gica de eliminaci\u00f3n existente solo filtra los elementos eliminados para todos los usuarios. Adem\u00e1s, la l\u00f3gica de compresi\u00f3n de cambios reduce incorrectamente create - delete a NOOP, lo cual es inseguro porque la compresi\u00f3n se aplica por p\u00e1gina y un elemento puede tener m\u00faltiples eventos de creaci\u00f3n; si una creaci\u00f3n anterior cae en una p\u00e1gina separada de un par posterior create -> delete, la eliminaci\u00f3n se descarta y la secuencia se colapsa a una creaci\u00f3n. Como resultado, la API delta devuelve un evento de creaci\u00f3n para un elemento eliminado con el contenido completo m\u00e1s reciente adjunto, exponiendo notas a las que el usuario ya no tiene acceso. Este problema ha sido solucionado en la versi\u00f3n 3.5.3."}], "id": "CVE-2026-34600", "lastModified": "2026-07-24T09:10:00.153", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-34600", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-20T14:10:05.523690Z", "version": "2.0.3"}}]}, "published": "2026-05-19T23:16:57.290", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/laurent22/joplin/issues/14110"}, {"source": "security-advisories@github.com", "url": "https://github.com/laurent22/joplin/pull/14289"}, {"source": "security-advisories@github.com", "url": "https://github.com/laurent22/joplin/security/advisories/GHSA-88x4-77rc-jw94"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/laurent22/joplin/security/advisories/GHSA-88x4-77rc-jw94"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}, {"lang": "en", "value": "CWE-281"}, {"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

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