CVE-2026-70491 Details
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. In 0.10.2 and earlier, the GET /api/v1/tools/, GET /api/v1/tools/list, and GET /api/v1/tools/id/{id} endpoints in backend/open_webui/routers/tools.py returned full Python tool source to authenticated non-admin read-only users. ToolResponse deliberately omitted source and specs, but ToolUserResponse permitted extra fields and handlers spread a full tool model dump into the response, re-admitting omitted fields. A non-admin with a read grant can obtain another user's server-side tool source, which commonly embeds hard-coded API keys, credentials, and internal service URLs. This issue is fixed in 0.11.0.
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Exploit prediction scoring system (EPSS) score for CVE-2026-70491
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%).
0.48 Probability of exploitation activity being observed over the next 30 days (40th percentile)
CVSS score for CVE-2026-70491
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.
6.5 Medium
Products affected by CVE-2026-70491
Open Webui 0.5.20
Open Webui 0.5.4
Open Webui 0.5.6
Open Webui 0.5.7
Open Webui 0.5.9
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-2026-70491 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 2,355 25.59%
DE 1,303 14.16%
CN 1,290 14.02%
SG 343 3.73%
FR 330 3.59%
GB 324 3.52%
KR 302 3.28%
RU 272 2.96%
JP 218 2.37%
CA 153 1.66%

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CVE-2026-70491 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 5,656 83.78%
Telecommunications 830 12.29%
Education 137 2.03%
Retail 22 0.33%
Government/Politics 21 0.31%
Media/Entertainment 17 0.25%
Engineering 15 0.22%
Business Services 8 0.12%
Utilities 7 0.10%
Manufacturing 7 0.10%

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