CVE-2026-87998 Details
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, DELETE /api/v1/knowledge/{id}/delete in backend/open_webui/routers/knowledge.py authorized deletion against the knowledge base but then removed its administrator-owned external connection without a separate administrator check or a check for other dependent knowledge bases. A non-administrator with write access to one external knowledge base could delete shared instance configuration and make every other knowledge base using that connection unavailable. This issue is fixed in version 0.11.1.
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Exploit prediction scoring system (EPSS) score for CVE-2026-87998
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%).
0.49 Probability of exploitation activity being observed over the next 30 days (40th percentile)
CVSS score for CVE-2026-87998
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-2026-87998
Open Webui 0.10.1
Open Webui 0.10.2
Open Webui 0.10.0
Open Webui 0.11.0
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-2026-87998 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 581 25.18%
DE 337 14.61%
CN 196 8.50%
RU 117 5.07%
KR 83 3.60%
FR 81 3.51%
GB 81 3.51%
SG 69 2.99%
JP 50 2.17%
CA 44 1.91%

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CVE-2026-87998 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 1,236 80.10%
Telecommunications 232 15.04%
Education 42 2.72%
Manufacturing 6 0.39%
Media/Entertainment 6 0.39%
Retail 4 0.26%
Utilities 4 0.26%
Engineering 4 0.26%
Consumer Goods 2 0.13%
Business Services 2 0.13%

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