Open WebUI: Users denied the image-generation permission can still generate images via chat completions

Exploitation

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

CVSS

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

EPSS

• CVE-2026-70484: 0.41% estimated exploitation activity in the next 30 days; percentile 35.64 (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Summary An authenticated user whose features.imagegeneration permission has been revoked can still make the server generate images by sending the feature flag in a chat-completion request. The chat pipeline took the client-supplied features object at face value and never re-checked the permission that the direct image routes enforce, so the denial applied to the UI affordance but not to the server-side generation path. Preconditions Image generation must be enabled and a provider configured by the administrator (ENABLEIMAGEGENERATION is off by default). The per-user permission defaults to granted, so only deployments where an administrator explicitly revoked it for some users are affected. On 0.10.0 and later the caller must also set params.functioncalling to legacy; on 0.9.x and earlier the legacy mode was the default, so no special parameter was needed. Deployments on native function calling are unaffected, since that path checks the permission before registering the image tools.…

Published by the source

4 Aug 2026, 19:56 UTC

Last modified by the source

4 Aug 2026, 19:57 UTC

Source last checked

26 Oct 2026, 13:50 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-g423-grf7-98rv

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# Patch Next advisory brief: CVE-2026-70484

Advisory: Open WebUI: Users denied the image-generation permission can still generate images via chat completions
IDs: CVE-2026-70484, GHSA-g423-grf7-98rv
Record: https://patchnext.com/advisories/cve-2026-70484 (revision 1, source checked 26 Oct 2026, 13:50 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: open-webui 0.11.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI open-webui: affected >= 0.7.0, < 0.11.0; fixed in 0.11.0

## 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://github.com/advisories/GHSA-g423-grf7-98rv (GitHub-reviewed advisory GHSA-g423-grf7-98rv lists affected ranges: PyPI open-webui >=0.7.0 <0.11.0)

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