CVE-2026-87011 Details
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.
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Exploit prediction scoring system (EPSS) score for CVE-2026-87011
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.64 Probability of exploitation activity being observed over the next 30 days (51th percentile)
CVSS score for CVE-2026-87011
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
7.5 High
Products affected by CVE-2026-87011
Open Webui 0.9.5
Open Webui 0.9.6
Open Webui 0.10.1
Open Webui 0.10.2
Open Webui 0.10.0
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Low
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CVE-2026-87011 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 1,534 26.67%
DE 849 14.76%
CN 595 10.35%
GB 234 4.07%
KR 210 3.65%
FR 197 3.43%
SG 195 3.39%
RU 183 3.18%
JP 137 2.38%
NL 97 1.69%

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CVE-2026-87011 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 3,332 82.29%
Telecommunications 546 13.48%
Education 91 2.25%
Retail 13 0.32%
Media/Entertainment 10 0.25%
Government/Politics 10 0.25%
Manufacturing 9 0.22%
Business Services 7 0.17%
Engineering 7 0.17%
Energy/Resources 5 0.12%

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