High 7.5Published Sep 9, 2026

CVE-2026-87011Open WebUI: Unauthenticated requests can stall the server via uncached OIDC fetches in back-channel logout

Updated under an hour ago (2026-10-19 09:10 UTC)

Does this affect you?

It affects open-webui and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for open-webui

Exploited in the last 30 days

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.1, the unauthenticated POST /oauth/backchannel-logout handler in backend/open_webui/utils/oauth.py fetched the OIDC discovery document and signing keys before validating a submitted logout token. Each request repeated uncached network fetches, and the signing-key lookup blocked the async event loop, so requests carrying invalid tokens could stall the single-worker instance and amplify traffic to the identity provider when ENABLE_OAUTH_BACKCHANNEL_LOGOUT was enabled. This issue is fixed in version 0.11.1.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-405, CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Sep 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

open-webui open-webui open_webui:open_webui (from the name)	from 0.9.0, < 0.11.1	CNA record
openwebui open_webui openwebui:open_webui	from 0.9.0 before 0.11.1	NVD

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-3g9q-v48f-hh9wx-refsource-confirm, exploit, vendor-advisory
https://github.com/open-webui/open-webui/commit/aeda6ff13a25d3b3ba1b303609f35382db22142cx-refsource-misc, patch
https://github.com/open-webui/open-webui/releases/tag/v0.11.1x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.