CVE-2026-45402 Details
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, multiple endpoints accept a user-supplied file_id and attach the referenced file to a resource the caller controls (folder knowledge, knowledge-base contents) without verifying that the caller owns or has been granted access to the file. The file's content then becomes reachable through the downstream RAG / file-content paths, allowing any authenticated user to exfiltrate any other user's private file — and on the knowledge-base path, also to overwrite it — given knowledge of the file's UUID. This affects backend/open_webui/routers/folders.py (POST /api/v1/folders/{id}/update), backend/open_webui/routers/knowledge.py (add_file_to_knowledge_by_id), and backend/open_webui/routers/knowledge.py (add_files_to_knowledge_by_id_batch). This vulnerability is fixed in 0.9.5.
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Exploit prediction scoring system (EPSS) score for CVE-2026-45402
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%).
0.35 Probability of exploitation activity being observed over the next 30 days (26th percentile)
CVSS score for CVE-2026-45402
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.
8.1 High
Products affected by CVE-2026-45402
Open Webui 0.6.17
Open Webui 0.6.18
Open Webui 0.6.2
Open Webui 0.6.22
Open Webui 0.6.25
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-2026-45402 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 1,102 24.63%
DE 700 15.64%
CN 569 12.72%
FR 201 4.49%
SG 176 3.93%
RU 169 3.78%
GB 147 3.28%
KR 128 2.86%
NL 94 2.10%
JP 87 1.94%

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CVE-2026-45402 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 2,718 83.81%
Telecommunications 393 12.12%
Education 57 1.76%
Retail 14 0.43%
Government/Politics 12 0.37%
Utilities 11 0.34%
Consumer Goods 10 0.31%
Business Services 7 0.22%
Media/Entertainment 4 0.12%
Engineering 3 0.09%

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