CVE-2026-33976

{"id": "CVE-2026-33976", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33976", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-03-31T00:00:00+00:00"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 9.6, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "streetwriters", "product": "Notesnook Web/Desktop", "versions": [{"status": "affected", "version": "< 3.3.11"}]}, {"vendor": "streetwriters", "product": "Notesnook iOS/Android", "versions": [{"status": "affected", "version": "< 3.3.17"}]}]}], "published": "2026-03-27T22:16:22.250", "references": [{"url": "https://github.com/streetwriters/notesnook/security/advisories/GHSA-f42f-phvp-43x5", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-79"}, {"lang": "en", "value": "CWE-94"}]}], "descriptions": [{"lang": "en", "value": "Notesnook is a note-taking app. Prior to version 3.3.11 on Web/Desktop and 3.3.17 on Android/iOS, a stored XSS in the Web Clipper rendering flow can be escalated to remote code execution in the desktop app. The root cause is that the clipper preserves attacker-controlled attributes from the source page\u2019s root element and stores them inside web-clip HTML. When the clip is later opened, Notesnook renders that HTML into a same-origin, unsandboxed iframe using `contentDocument.write(...)`. Event-handler attributes such as `onload`, `onclick`, or `onmouseover` execute in the Notesnook origin. In the desktop app, this becomes RCE because Electron is configured with `nodeIntegration: true` and `contextIsolation: false`. Version 3.3.11 Web/Desktop and 3.3.17 on Android/iOS patch the issue."}, {"lang": "es", "value": "Notesnook es una aplicaci\u00f3n para tomar notas. Antes de la versi\u00f3n 3.3.11 en Web/Escritorio y 3.3.17 en Android/iOS, un XSS almacenado en el flujo de renderizado de Web Clipper puede escalarse a ejecuci\u00f3n remota de c\u00f3digo en la aplicaci\u00f3n de escritorio. La causa ra\u00edz es que el clipper preserva atributos controlados por el atacante del elemento ra\u00edz de la p\u00e1gina de origen y los almacena dentro del HTML del web-clip. Cuando el clip se abre posteriormente, Notesnook renderiza ese HTML en un iframe de mismo origen y sin sandbox usando \u2019contentDocument.write(...)\u2019. Atributos de gestor de eventos como \u2019onload\u2019, \u2019onclick\u2019 o \u2019onmouseover\u2019 se ejecutan en el origen de Notesnook. En la aplicaci\u00f3n de escritorio, esto se convierte en RCE porque Electron est\u00e1 configurado con \u2019nodeIntegration: true\u2019 y \u2019contextIsolation: false\u2019. La versi\u00f3n 3.3.11 Web/Escritorio y 3.3.17 en Android/iOS parchean el problema."}], "lastModified": "2026-10-26T21:10:00.170", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:streetwriters:notesnook_desktop:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "08C11EDB-67C1-4E85-A07D-0164CB036757", "versionEndExcluding": "3.3.11"}, {"criteria": "cpe:2.3:a:streetwriters:notesnook_mobile:*:*:*:*:*:android:*:*", "vulnerable": true, "matchCriteriaId": "105C802D-D317-4B9A-B883-D07A1E0840E6", "versionEndExcluding": "3.3.17"}, {"criteria": "cpe:2.3:a:streetwriters:notesnook_mobile:*:*:*:*:*:iphone_os:*:*", "vulnerable": true, "matchCriteriaId": "858B01C2-38C3-4093-A638-E380119ABDF5", "versionEndExcluding": "3.3.17"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}