CVE-2026-45315 Details
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the audio transcription upload endpoint takes the file extension from the user-supplied filename and saves the file under CACHE_DIR/audio/transcriptions/.. The /cache/{path} route serves these files via FileResponse, which sets Content-Type from the on-disk extension and emits no Content-Disposition. A verified user with the default-on chat.stt permission can upload a polyglot WAV+HTML file named pwn.html and trick any other user into opening the resulting URL — the response comes back as text/html and any embedded runs in the Open WebUI origin. This vulnerability is fixed in 0.9.3.
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Exploit prediction scoring system (EPSS) score for CVE-2026-45315
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%).
0.18 Probability of exploitation activity being observed over the next 30 days (8th percentile)
CVSS score for CVE-2026-45315
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.
8.7 High
Products affected by CVE-2026-45315
Open Webui 0.8.2
Open Webui 0.8.3
Open Webui 0.8.4
Open Webui 0.8.5
Open Webui 0.8.6
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-2026-45315 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 1,097 24.56%
DE 699 15.65%
CN 569 12.74%
FR 201 4.50%
SG 176 3.94%
RU 168 3.76%
GB 147 3.29%
KR 128 2.87%
NL 94 2.10%
JP 87 1.95%

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CVE-2026-45315 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 2,713 83.81%
Telecommunications 392 12.11%
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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