{
 "id": "CVE-2026-109290",
 "description": "Open WebUI from 0.11.1 before 0.11.4 contains a stored cross-site scripting vulnerability in DocxPreview.svelte that allows authenticated users to execute script by uploading crafted DOCX attachments. Attackers can embed an OOXML altChunk HTML part or script-scheme hyperlink to steal a previewing administrator's session token from local storage and take over the instance.",
 "published": "2026-10-12",
 "last_modified": "2026-10-23",
 "vuln_status": "Awaiting Analysis",
 "cna": "disclosure@vulncheck.com",
 "cvss": {
  "version": "4.0",
  "score": 8.4,
  "severity": "HIGH",
  "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
  "source": "disclosure@vulncheck.com"
 },
 "cwe": [
  "CWE-79",
  "CWE-1021"
 ],
 "products": [
  {
   "vendor": "Open WebUI",
   "product": "Open WebUI",
   "versions_affected": null,
   "fixed_in": null,
   "product_id": null
  }
 ],
 "category": "infrastructure",
 "surface": [],
 "kev": null,
 "fix": {
  "status": "unknown",
  "version": null,
  "url": null
 },
 "references": [
  {
   "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-f9xp-mfmq-x6cg",
   "source": "disclosure@vulncheck.com",
   "tags": []
  },
  {
   "url": "https://www.vulncheck.com/advisories/open-webui-0.11.1-before-0.11.4-stored-xss-via-docx-preview",
   "source": "disclosure@vulncheck.com",
   "tags": []
  },
  {
   "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-f9xp-mfmq-x6cg",
   "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
   "tags": []
  }
 ],
 "related_agents": [
  "open-webui-open-webui"
 ],
 "related_incidents": [],
 "match": {
  "tests": [
   "A:name"
  ],
  "terms": [
   "open-webui:Open WebUI"
  ]
 },
 "status": "candidate",
 "note": null,
 "reviewer": null,
 "checked_on": null,
 "retrieved_on": "2026-10-25"
}