What’s Vulnerable › Vulnerabilities

CVE-2025-46571: Open WebUI vulnerable to limited stored XSS vila uploaded html file

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-05-05 · updated 2026-06-17
• Weakness: CWE-79

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.6.6, low privileged users can upload HTML files which contain JavaScript code via the `/api/v1/files/` backend endpoint. This endpoint returns a file id, which can be used to open the file in the browser and trigger the JavaScript code in the user's browser. Under the default settings, files uploaded by low-privileged users can only be viewed by admins or themselves, limiting the impact of this vulnerability. A link to such a file can be sent to an admin, and if clicked, will give the low-privileged user complete control over the admin's account, ultimately enabling RCE via functions. Version 0.6.6 contains a fix for the issue.

Affected products

• open-webui: before 0.6.6 — fixed in 0.6.6

How to fix

Upgrade to a fixed version: open-webui 0.6.6. Check the vendor advisory for mitigations.

References

• https://github.com/open-webui/open-webui/blob/main/backend/open_webui/routers/files.py#L434-L438
• https://github.com/open-webui/open-webui/commit/ef2aeb7c0eb976bac759e59ac359c94a5b8dc7e0
• https://github.com/open-webui/open-webui/security/advisories/GHSA-8gh5-qqh8-hq3x

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