{"id":"CVE-2026-33976","summary":"Notesnook vulnerable to RCE via stored XSS in Web Clipper rendering","details":"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’s 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.","aliases":["GHSA-f42f-phvp-43x5"],"modified":"2026-04-02T13:29:15.882800Z","published":"2026-03-27T21:26:10.127Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-79","CWE-94"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33976.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33976.json"},{"type":"ADVISORY","url":"https://github.com/streetwriters/notesnook/security/advisories/GHSA-f42f-phvp-43x5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33976"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/streetwriters/notesnook","events":[{"introduced":"0"},{"fixed":"00a20dda48e63d04fec7724b8707c3a6b913f673"},{"fixed":"0af831d50b4de3a9766cf8d5ab33238ade61bf27"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"3.3.11"},{"fixed":"3.3.17"}]}}],"versions":["2.2.0-android","2.2.1-android","2.2.2-android","2.2.3-android","2.2.4-android","2.2.5-android","2.2.6-android","2.3.0-android","2.4.0-android","2.4.1-android","2.4.10-android","2.4.11-android","2.4.12-android","2.4.13-android","2.4.14-android","2.4.15-android","2.4.16-android","2.4.17-android","2.4.2-android","2.4.3-android","2.4.4-android","2.4.5-android","2.4.6-android","2.4.7-android","2.4.8-android","2.4.9-android","2.5.0-android","2.5.1-android","2.5.2-android","2.5.3-android","2.5.4-android","2.5.5-android","2.5.6-android","2.6.0-android","2.6.1-android","2.6.10-android","2.6.11-android","2.6.12-android","2.6.14-android","2.6.15-android","2.6.16-android","2.6.17-android","2.6.18-android","2.6.2-android","2.6.3-android","2.6.4-android","2.6.5-android","2.6.6-android","2.6.7-android","2.6.8-android","2.6.9-android","3.0.0-android","3.0.0-beta-android","3.0.1-android","3.0.1-beta-android","3.0.10-android","3.0.10-beta-android","3.0.11-android","3.0.11-beta-android","3.0.12-android","3.0.12-beta-android","3.0.13-android","3.0.13-beta-android","3.0.14-android","3.0.14-beta-android","3.0.15-android","3.0.15-beta-android","3.0.16-android","3.0.16-beta-android","3.0.17-android","3.0.17-beta-android","3.0.18-android","3.0.19-android","3.0.2-android","3.0.2-beta-android","3.0.20-android","3.0.21-android","3.0.22-android","3.0.23-android","3.0.24-android","3.0.25-android","3.0.26-android","3.0.27-android","3.0.28-android","3.0.29-android","3.0.3-android","3.0.3-beta-android","3.0.30-android","3.0.31-android","3.0.32-android","3.0.4-android","3.0.4-beta-android","3.0.5-android","3.0.5-beta-android","3.0.6-android","3.0.6-beta-android","3.0.7-android","3.0.7-beta-android","3.0.8-android","3.0.8-beta-android","3.0.9-android","3.0.9-beta-android","3.1.0-android","3.1.0-beta.0-beta-android","3.1.0-beta.1-beta-android","3.1.0-beta.2-beta-android","3.1.0-beta.3-beta-android","3.1.0-beta.4-beta-android","3.1.1-android","3.2.0-android","3.2.0-beta.0-beta-android","3.2.0-beta.1-beta-android","3.2.0-beta.2-beta-android","3.2.0-beta.3-beta-android","3.2.0-beta.4-beta-android","3.2.1-android","3.2.10-android","3.2.11-android","3.2.12-android","3.2.2-android","3.2.3-android","3.2.4-android","3.2.5-android","3.2.7-android","3.2.8-android","3.2.9-android","3.3.0-android","3.3.1-android","3.3.10-android","3.3.10-beta.0-beta-android","3.3.10-beta.1-beta-android","3.3.10-beta.2-beta-android","3.3.10-beta.3-beta-android","3.3.10-beta.4-beta-android","3.3.10-beta.5-beta-android","3.3.10-beta.6-beta-android","3.3.11-android","3.3.12-android","3.3.13-android","3.3.13-beta.0-beta-android","3.3.13-beta.1-beta-android","3.3.14-android","3.3.15-android","3.3.15-beta.0-beta-android","3.3.15-beta.1-beta-android","3.3.16-android","3.3.2-android","3.3.3-android","3.3.4-android","3.3.5-android","3.3.6-android","3.3.7-android","3.3.8-android","3.3.9-android","v2.2.0","v2.2.1","v2.2.2","v2.2.3","v2.2.4","v2.3.0","v2.4.0","v2.4.1","v2.4.10","v2.4.11","v2.4.2","v2.4.3","v2.4.4","v2.4.5","v2.4.6","v2.4.7","v2.4.8","v2.4.9","v2.5.0","v2.5.1","v2.5.2","v2.5.3","v2.5.4","v2.5.5","v2.5.6","v2.5.7","v2.5.8","v2.6.0","v2.6.1","v2.6.10","v2.6.11","v2.6.12","v2.6.13","v2.6.14","v2.6.15","v2.6.16","v2.6.17","v2.6.2","v2.6.3","v2.6.4","v2.6.5","v2.6.6","v2.6.7","v2.6.8","v2.6.9","v3.0.0","v3.0.0-beta","v3.0.1","v3.0.1-beta","v3.0.10","v3.0.10-beta","v3.0.11","v3.0.11-beta","v3.0.12","v3.0.12-beta","v3.0.13","v3.0.13-beta","v3.0.14","v3.0.14-beta","v3.0.15","v3.0.16","v3.0.17","v3.0.18","v3.0.19","v3.0.2","v3.0.2-beta","v3.0.20","v3.0.21","v3.0.22","v3.0.23","v3.0.24","v3.0.25","v3.0.26","v3.0.27","v3.0.28","v3.0.29","v3.0.3","v3.0.3-beta","v3.0.30","v3.0.31","v3.0.32","v3.0.4","v3.0.4-beta","v3.0.5","v3.0.5-beta","v3.0.6","v3.0.6-beta","v3.0.7","v3.0.7-beta","v3.0.8","v3.0.8-beta","v3.0.9","v3.0.9-beta","v3.1.0","v3.1.0-beta.0","v3.1.0-beta.1","v3.1.0-beta.2","v3.1.0-beta.3","v3.1.0-beta.4","v3.1.0-beta.5","v3.1.0-beta.6","v3.1.1","v3.2.0","v3.2.0-beta.0","v3.2.0-beta.1","v3.2.0-beta.2","v3.2.0-beta.3","v3.2.0-beta.4","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