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CVE-2026-109290

8.7 · HIGH

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.

Published Oct 12, 2026CWE-79EPSS 0.31%

Overview

CVE-2026-109290 is a high-severity vulnerability. It was published on October 12, 2026 and has a CVSS 3.1 base score of 8.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/open-webui/open-webui/security/advisories/GHSA-f9xp-mfmq-x6cgRefwww.vulncheck.com/advisories/open-webui-0.11.1-before-0.11.4-stored-xss-via-docx-previewGitHubgithub.com/open-webui/open-webui/security/advisories/GHSA-f9xp-mfmq-x6cg

How CyberStrike helps

Frequently asked questions

What is CVE-2026-109290?

CVE-2026-109290 is a high-severity vulnerability. It was published on October 12, 2026 and has a CVSS 3.1 base score of 8.7 (HIGH).

How severe is CVE-2026-109290?

This vulnerability has a CVSS 3.1 base score of 8.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-109290?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-109290?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-109290 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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