CVE-2026-44556 Details
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the /responses endpoint in the OpenAI router accepts any authenticated user and forwards requests directly to upstream LLM providers without enforcing per-model access control. While the primary chat completion endpoint (generate_chat_completion) checks model ownership, group membership, and AccessGrants before allowing a request, the /responses proxy only validates that the user has a valid session via get_verified_user. This allows any authenticated user to interact with any model configured on the instance by sending a POST request to /api/openai/responses with an arbitrary model ID. This vulnerability is fixed in 0.9.0.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2026-44556
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%).
0.31 Probability of exploitation activity being observed over the next 30 days (22nd percentile)
CVSS score for CVE-2026-44556
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.
7.1 High
Products affected by CVE-2026-44556
Open Webui 0.4.8
Open Webui 0.5.10
Open Webui 0.5.14
Open Webui 0.5.16
Open Webui 0.5.19
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-2026-44556 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 1,012 24.66%
DE 642 15.65%
CN 538 13.11%
FR 181 4.41%
SG 169 4.12%
RU 150 3.66%
GB 137 3.34%
KR 112 2.73%
NL 87 2.12%
JP 81 1.97%

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CVE-2026-44556 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 2,511 84.06%
Telecommunications 360 12.05%
Education 51 1.71%
Government/Politics 12 0.40%
Retail 12 0.40%
Utilities 10 0.33%
Consumer Goods 10 0.33%
Business Services 6 0.20%
Media/Entertainment 3 0.10%
Engineering 3 0.10%

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