Open WebUI vulnerable to Stored XSS via iFrame in citations model

Exploitation

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

CVSS

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

EPSS

• CVE-2026-26192: 0.23% estimated exploitation activity in the next 30 days; percentile 14.29 (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 Manually modifying chat history allows setting the html property within document metadata. This causes the frontend to enter a code path that treats document contents as HTML, and render them in an iFrame when the citation is previewed. This allows stored XSS via a weaponised document payload in a chat. The payload also executes when the citation is viewed on a shared chat. Details The vulnerability stems from how iFrame are implemented here: https://github.com/open-webui/open-webui/blob/6f1486ffd0cb288d0e21f41845361924e0d742b3/src/lib/components/chat/Messages/Citations/CitationModal.svelte#L163-L170 The html attribute can be controlled by a user who manually edits the chat history. Since allow-scripts and allow-same-origin are harcoded here the sandboxing offers essentially no protection. PoC Create an arbitrary chat with a file upload attached: <img width="2462" height="1148" alt="image" src="https://github.com/user-attachments/assets/fad83c74-036d-41b8-bc44-87bf2a538b21" /…

Published by the source

7 Jul 2026, 16:51 UTC

Last modified by the source

13 Jul 2026, 16:43 UTC

Source last checked

26 Oct 2026, 13:46 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-xc8p-9rr6-97r2

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-xc8p-9rr6-97r2

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# Patch Next advisory brief: CVE-2026-26192

Advisory: Open WebUI vulnerable to Stored XSS via iFrame in citations model
IDs: CVE-2026-26192, GHSA-xc8p-9rr6-97r2
Record: https://patchnext.com/advisories/cve-2026-26192 (revision 2, 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: High (CVSS 7.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: open-webui 0.7.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI open-webui: affected < 0.7.0; fixed in 0.7.0

## 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-xc8p-9rr6-97r2 (OSV record GHSA-xc8p-9rr6-97r2 lists affected ranges: PyPI open-webui >=0 <0.7.0 (fixed))
- Verified: https://github.com/advisories/GHSA-xc8p-9rr6-97r2 (GitHub-reviewed advisory GHSA-xc8p-9rr6-97r2 lists affected ranges: PyPI open-webui >=0 <0.7.0)

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