CVE-2026-100636

{
  "etk_id": "ETK-2026-266",
  "cve_id": "CVE-2026-100636",
  "display_id": "CVE-2026-100636",
  "ghsa_id": "GHSA-jf98-m24w-gm9m",
  "euvd_id": "EUVD-2026-87730",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Path traversal file write in SiYuan exportBrowserHTML",
  "summary": "SiYuan versions before 3.8.4 allow an authenticated administrator to use the exportBrowserHTML endpoint to write attacker-controlled HTML to index.html outside the intended export directory. Exploitation requires administrator credentials and a pre-existing destination directory writable by the SiYuan kernel process; affected deployments may be exposed even when configured read-only.",
  "mitigation": "Upgrade SiYuan to v3.8.4 or later. Until upgraded, restrict administrator API access and prevent untrusted users from obtaining administrator credentials.",
  "vendor": "go",
  "product": "go:github.com/siyuan-note/siyuan",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 3.8.3"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "v3.8.4"
      ],
      "package_name": "github.com/siyuan-note/siyuan",
      "purl": "pkg:golang/github.com/siyuan-note/siyuan"
    }
  ],
  "cwes": [
    22
  ],
  "cvss_score": 7.6,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:L",
  "epss_score": 0.0054,
  "epss_percentile": 0.4457,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 26.426225483333333,
  "t0_at": "2026-09-26T13:23:10.528000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-03T19:00:58.333893+00:00",
      "days": 7.234581086724537,
      "is_lower_bound": false,
      "measured_at": "2026-09-26T13:23:10.528000+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-09-10T15:05:17+00:00",
      "days": -15.92909175925926,
      "is_lower_bound": false,
      "measured_at": "2026-09-26T13:23:10.528000+00:00",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jf98-m24w-gm9m"
    },
    "trigger_signal": {
      "at": "2026-09-26T13:23:10.528000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-26T13:23:10.528000+00:00",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jf98-m24w-gm9m"
    }
  }
}