CVE-2026-109290

CVSS 8.7 (high) · published 2026-10-12

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.

Weakness: CWE-79, CWE-1021

Source: NVD CVE-2026-109290

References

• https://github.com/open-webui/open-webui/security/advisories/GHSA-f9xp-mfmq-x6cg
• https://www.vulncheck.com/advisories/open-webui-0.11.1-before-0.11.4-stored-xss-via-docx-preview
• https://github.com/open-webui/open-webui/security/advisories/GHSA-f9xp-mfmq-x6cg

Check your software

Connect an AI agent to the FixLane MCP server or ask the Telegram bot to check what you have installed against incidents with a verified fixed version.