CVE-2026-56400 Details
open-webui before 0.3.14 contains a cross-origin resource sharing misconfiguration allowing arbitrary origins with allow_origins=* and authenticated requests to the /api/v1/functions endpoint. Attackers can execute arbitrary code on the openwebui instance by crafting malicious cross-site requests from attacker-controlled websites when an admin user visits them.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2026-56400
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 (27th percentile)
CVSS score for CVE-2026-56400
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.
8.3 High
Products affected by CVE-2026-56400
Open Webui 0.3.12
Open Webui 0.3.13
Open Webui 0.3.4
Open Webui 0.3.7
Open Webui 0.1.122
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-2026-56400 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 10 22.22%
CN 8 17.78%
DE 5 11.11%
FR 4 8.89%
RU 3 6.67%
ID 2 4.44%
IN 2 4.44%
GB 1 2.22%
HK 1 2.22%
AU 1 2.22%

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CVE-2026-56400 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 31 83.78%
Telecommunications 6 16.22%

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