Medium
Notesnook: Stored XSS in mobile share editor via unescaped web clip title metadata
Type: advisorySources: OSV
Notesnook is a note-taking app focused on user privacy & ease of use. Prior to version 3.3.17, a stored XSS vulnerability exists in the mobile share / web clip flow because attacker-controlled clip metadata is concatenated into HTML without escaping and then rendered with innerHTML inside the mobile share editor WebView. An attacker can control the shared title metadata (for example through Android/iOS share metadata such as TITLE / SUBJECT, or through link-preview title data) and inject HTML such as . When the victim opens the Notesnook share flow and selects Web clip, the payload is inserted into the generated HTML and executed in the mobile editor WebView. This issue has been patched in version 3.3.17.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-33978
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 20:10 UTC · Revision 1
Source evidence
Notesnook: Stored XSS in mobile share editor via unescaped web clip title metadata
core-osv · Original sourcePublished 1 Apr 2026, 16:11 UTC
Notesnook is a note-taking app focused on user privacy & ease of use. Prior to version 3.3.17, a stored XSS vulnerability exists in the mobile share / web clip flow because attacker-controlled clip metadata is concatenated into HTML without escaping and then rendered with innerHTML inside the mobile share editor WebView. An attacker can control the shared title metadata (for example through Android/iOS share metadata such as TITLE / SUBJECT, or through link-preview title data) and inject HTML such as . When the victim opens the Notesnook share flow and selects Web clip, the payload is inserted into the generated HTML and executed in the mobile editor WebView. This issue has been patched in version 3.3.17.
osv:CVE-2026-33978
Complete source record
{
"id": "25a560f82a34b728efffbcecdcfdc668b128934150968c023a99dc37ff984208",
"url": "https://osv.dev/vulnerability/CVE-2026-33978",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Notesnook: Stored XSS in mobile share editor via unescaped web clip title metadata",
"summary": "Notesnook is a note-taking app focused on user privacy & ease of use. Prior to version 3.3.17, a stored XSS vulnerability exists in the mobile share / web clip flow because attacker-controlled clip metadata is concatenated into HTML without escaping and then rendered with innerHTML inside the mobile share editor WebView. An attacker can control the shared title metadata (for example through Android/iOS share metadata such as TITLE / SUBJECT, or through link-preview title data) and inject HTML such as . When the victim opens the Notesnook share flow and selects Web clip, the payload is inserted into the generated HTML and executed in the mobile editor WebView. This issue has been patched in version 3.3.17.",
"evidence": "osv:CVE-2026-33978",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-33978",
"aliases": [
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"GHSA-f27j-fqc6-v7pm"
],
"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
}
],
"affected": [
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"modified": "2026-10-28T02:30:39.035691199Z",
"provider": "osv",
"references": [
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"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33978.json",
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},
"source_id": "core-osv",
"document_id": 506527,
"published_at": "2026-04-01T16:11:56.61+00:00"
}