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Trilium: Stored XSS in note icon rendering leads to Remote Code Execution in Electron desktop app

Type: advisorySources: OSV

Trilium Notes is a cross-platform, hierarchical note taking application focused on building large personal knowledge bases. Prior to 0.103.0, the #iconClass label value is returned raw by getNoteIcon() and inserted without HTML attribute encoding into class attributes in apps/client/src/widgets/quick_search.ts and apps/client/src/services/note_autocomplete.ts, allowing a stored payload to execute automatically when a victim opens a new tab or uses Ctrl+J and, because Electron enables nodeIntegration and disables contextIsolation, run operating-system commands as the victim. This issue is fixed in version 0.103.0.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-45733
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 18:53 UTC · Revision 1

Source evidence

Trilium: Stored XSS in note icon rendering leads to Remote Code Execution in Electron desktop app

core-osv · Original source

Published 18 Aug 2026, 15:13 UTC

Trilium Notes is a cross-platform, hierarchical note taking application focused on building large personal knowledge bases. Prior to 0.103.0, the #iconClass label value is returned raw by getNoteIcon() and inserted without HTML attribute encoding into class attributes in apps/client/src/widgets/quick_search.ts and apps/client/src/services/note_autocomplete.ts, allowing a stored payload to execute automatically when a victim opens a new tab or uses Ctrl+J and, because Electron enables nodeIntegration and disables contextIsolation, run operating-system commands as the victim. This issue is fixed in version 0.103.0.

osv:CVE-2026-45733
Complete source record
{
  "id": "af40bb488c0088c43773c09d12044ec5d3b9b2c2c2a65a0d62309c46215ea6cb",
  "url": "https://osv.dev/vulnerability/CVE-2026-45733",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Trilium: Stored XSS in note icon rendering leads to Remote Code Execution in Electron desktop app",
    "summary": "Trilium Notes is a cross-platform, hierarchical note taking application focused on building large personal knowledge bases. Prior to 0.103.0, the #iconClass label value is returned raw by getNoteIcon() and inserted without HTML attribute encoding into class attributes in apps/client/src/widgets/quick_search.ts and apps/client/src/services/note_autocomplete.ts, allowing a stored payload to execute automatically when a victim opens a new tab or uses Ctrl+J and, because Electron enables nodeIntegration and disables contextIsolation, run operating-system commands as the victim. This issue is fixed in version 0.103.0.",
    "evidence": "osv:CVE-2026-45733",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-45733",
      "aliases": [
        "CVE-2026-45733",
        "GHSA-h45q-4qc4-8hhg"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/triliumnext/trilium",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "44f5be88b776078fe268dc9877411cb144df3a46"
                },
                {
                  "fixed": "c06939448bcc2879fc3c4d328ff7dc63ed6b5009"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.103.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c06939448bcc2879fc3c4d328ff7dc63ed6b5009"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "44f5be88b776078fe268dc9877411cb144df3a46"
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                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.103.0"
                  }
                ]
              }
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          ],
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45733.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.261670306Z",
      "provider": "osv",
      "references": [
        "https://github.com/TriliumNext/Trilium/releases/tag/v0.103.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45733.json",
        "https://github.com/TriliumNext/Trilium/security/advisories/GHSA-h45q-4qc4-8hhg",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-45733",
        "https://github.com/TriliumNext/Trilium/commit/c06939448bcc2879fc3c4d328ff7dc63ed6b5009"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-693",
          "CWE-79",
          "CWE-83"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45733.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-45733",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488755,
  "published_at": "2026-08-18T15:13:16.946+00:00"
}