---
title: "CVE-2026-87011: Open WebUI - Denial of Service"
description: "Open WebUI 0.9.0 to 0.11.1 contains a denial of service caused by uncached network fetches and blocking signing-key lookup in the unauthenticated POST /oauth/backchannel-logout handler, letting remote attackers stall the single-worker instance and amplify traffic, exploit requires ENABLE_OAUTH_BACKCHANNEL_LOGOUT enabled."
url: https://panop.io/threat-heartbeat/CVE-2026-87011/
---

# CVE-2026-87011 Open WebUI - Denial of Service

Open WebUI 0.9.0 to 0.11.1 contains a denial of service caused by uncached network fetches and blocking signing-key lookup in the unauthenticated POST /oauth/backchannel-logout handler, letting remote attackers stall the single-worker instance and amplify traffic, exploit requires ENABLE\_OAUTH\_BACKCHANNEL\_LOGOUT enabled.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

Proof of concept available

EPSS

0.64% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-87011)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

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

Published

9 September 2026

Updated

15 October 2026

Weakness

[CWE-405](https://cwe.mitre.org/data/definitions/405.html)

## Vendor fix

Update to version 0.11.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-87011](https://nvd.nist.gov/vuln/detail/CVE-2026-87011)
- [https://github.com/open-webui/open-webui/commit/aeda6ff13a25d3b3ba1b303609f35382db22142c](https://github.com/open-webui/open-webui/commit/aeda6ff13a25d3b3ba1b303609f35382db22142c)
- [https://github.com/open-webui/open-webui/releases/tag/v0.11.1](https://github.com/open-webui/open-webui/releases/tag/v0.11.1)
- [https://github.com/open-webui/open-webui/security/advisories/GHSA-3g9q-v48f-hh9w](https://github.com/open-webui/open-webui/security/advisories/GHSA-3g9q-v48f-hh9w)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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