Open WebUI: Unauthenticated endpoint can trigger embedding generation (cost/DoS)

Exploitation

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

CVSS

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

EPSS

• CVE-2026-45667: 0.34% estimated exploitation activity in the next 30 days; percentile 27.71 (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 GET /api/v1/memories/ef is accessible without authentication and executes request.app.state.EMBEDDINGFUNCTION(...). This allows any unauthenticated caller to trigger embedding generation which can lead to direct cost exposure if a paid provider is used. Code reference: backend/openwebui/routers/memories.py (@router.get("/ef") - calls request.app.state.EMBEDDINGFUNCTION("hello world")). Details GET /api/v1/memories/ef is reachable without authentication and triggers request.app.state.EMBEDDINGFUNCTION("hello world"). This crosses an intended security boundary by allowing unauthenticated users to invoke potentially expensive embedding computation and/or paid upstream embedding APIs. PoC 1. Start Open WebUI in default configuration (no special env hardening; default ENABLEMEMORIES is true). 2. From an unauthenticated client (no cookies/Authorization header), call: curl -i http://\<host\:\<port\/api/v1/memories/ef 3. Observe the server performs embedding generation and returns a…

Published by the source

14 May 2026, 20:28 UTC

Last modified by the source

13 Jul 2026, 16:43 UTC

Source last checked

26 Oct 2026, 13:41 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-m69w-p7m4-585j

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-m69w-p7m4-585j

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# Patch Next advisory brief: CVE-2026-45667

Advisory: Open WebUI: Unauthenticated endpoint can trigger embedding generation (cost/DoS)
IDs: CVE-2026-45667, GHSA-m69w-p7m4-585j
Record: https://patchnext.com/advisories/cve-2026-45667 (revision 2, source checked 26 Oct 2026, 13:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: open-webui 0.8.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI open-webui: affected <= 0.7.2; fixed in 0.8.0

## 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-m69w-p7m4-585j (OSV record GHSA-m69w-p7m4-585j lists affected ranges: PyPI open-webui >=0 <0.8.0 (fixed))
- Verified: https://github.com/advisories/GHSA-m69w-p7m4-585j (GitHub-reviewed advisory GHSA-m69w-p7m4-585j lists affected ranges: PyPI open-webui >=0 <=0.7.2)

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