{"id":"CVE-2026-109290","title":"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","summary":"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 altChun…","severity":"high","cvss":7.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","cwe":["CWE-79","CWE-1021"],"vendor":"open-webui","product":"open-webui","affected":["open-webui >= 0.11.1 < 0.11.4"],"published":"2026-10-12","updated":"2026-10-15","sourceUpdated":"2026-10-15T15:55:45.630","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109290","references":[{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-f9xp-mfmq-x6cg","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/open-webui-0.11.1-before-0.11.4-stored-xss-via-docx-preview","label":"disclosure@vulncheck.com"},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-f9xp-mfmq-x6cg","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00313,"epssPercentile":0.24092,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-10-13T18:07:52.173676Z"},"ingestedAt":"2026-10-12T18:00:08.190Z","scores":{"nvd":7.3,"cna":8.7},"slug":"CVE-2026-109290","body":"## Overview\n\nOpen 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":52,"depthScoreParts":{"impact":40.2,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":221049,"id":"CVE-2026-109290","ts":1792027025982,"field":"exploit_available","old":"false","new":"true"}]}