CVE-2026-109290: high-severity vulnerability in open-webui
Open WebUI 0.11.1 before 0.11.4 Stored XSS via DOCX Preview
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.4epss 0.3%
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.
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
Affected products
open-webui · open-webuiRelated CVEs — open-webui
In the same product, most dangerous first.
CVE-2025-64496HIGHOpen WebUI Affected by an External Model Server (Direct Connections) Code Injection via SSE EventsEPSS 7.2%CVE-2026-34222HIGHOpen WebUI has Broken Access Control in Tool ValvesEPSS 5.1%CVE-2025-65958HIGHOpen WebUI vulnerable to Server-Side Request Forgery (SSRF) via Arbitrary URL Processing in /api/v1/retrieval/process/webEPSS 4.4%CVE-2026-28788HIGHOpen WebUI's process_files_batch() endpoint missing ownership check, allows unauthorized file overwriteEPSS 3.0%CVE-2026-44551CRITICALOpen WebUI: LDAP Empty Password Authentication BypassEPSS 1.5%CVE-2026-45397MEDIUMOpen WebUI: Unauthenticated RAG Configuration DisclosureEPSS 0.8%