CVE-2026-87994 Details
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.5 until 0.11.1, the channel branch of chat_completion in backend/open_webui/main.py checked channel write access and channel membership for a supplied message_id but did not verify that the calling user authored the targeted message. A channel member could use the chat completions endpoint to replace another member's message while preserving the victim as the stored author, altering the conversation record without gaining access to other channels. This issue is fixed in version 0.11.1.
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Exploit prediction scoring system (EPSS) score for CVE-2026-87994
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%).
0.37 Probability of exploitation activity being observed over the next 30 days (31st percentile)
CVSS score for CVE-2026-87994
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.
4.3 Medium
Products affected by CVE-2026-87994
Open Webui 0.9.5
Open Webui 0.9.6
Open Webui 0.10.1
Open Webui 0.10.2
Open Webui 0.10.0
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-2026-87994 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 1,317 26.43%
DE 729 14.63%
CN 508 10.19%
GB 207 4.15%
KR 187 3.75%
FR 166 3.33%
SG 164 3.29%
RU 162 3.25%
JP 118 2.37%
IR 87 1.75%

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CVE-2026-87994 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 2,856 82.00%
Telecommunications 473 13.58%
Education 84 2.41%
Retail 12 0.34%
Manufacturing 9 0.26%
Media/Entertainment 9 0.26%
Government/Politics 8 0.23%
Engineering 6 0.17%
Energy/Resources 5 0.14%
Utilities 4 0.11%

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