CVE-2026-109290

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

8.4CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

8.7CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 24% of CVEs (scores of 2026-10-25)

CWEs

CWE-79, CWE-1021

Published

2026-10-12

Modified

2026-10-23

Record from

the NVD, synced 2026-10-24

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

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