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Back to active CVEs
High · CVSS 7.5CVE-2026-87011GHSA-3G9Q-V48F-HH9W

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

Answer in brief

CVE-2026-87011 records a High severity (CVSS 7.5) vulnerability in Open WebUI: Unauthenticated requests can stall the server via uncached OIDC fetches in back-channel logout. The current sources do not mark it as known exploited. The current feed maps open-webui/open-webui (generic), open-webui (pip), open-webui (pypi). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 9, 2026Updated Sep 15, 2026Source checked Oct 25, 2026First seen by HOL Sep 9, 2026Material review Sep 15, 2026
Upstream Advisory

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-405, CWE-770
Source
CVE List V5
Source checked
Oct 25, 2026
References
6 linked sources
Open source record

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps open-webui/open-webui (generic), open-webui (pip), open-webui (pypi). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
open-webui/open-webuigeneric>= 0.9.0, < 0.11.1Not reported
open-webuipip>=0.9.0,<=0.11.00.11.1
open-webuipypi>=0.9.0 <0.11.10.11.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for open-webui/open-webui, open-webui, open-webui.
  2. 2Review the reported fix. Update open-webui to 0.11.1; open-webui to 0.11.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 9, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • NVD vulnerability recordnvd.nist.gov
  • GitHub security advisorygithub.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.