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Open Webui EUVD-2026-17977

| CVE-2026-34222 HIGH
Improper Authorization (CWE-285)
2026-04-01 GitHub_M GHSA-7429-hxcv-268m
Authentication Bypass Open Webui
7.7
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
7.7 HIGH
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

4
Patch released
Apr 02, 2026 - 02:30 nvd
Patch available
EUVD ID Assigned
Apr 01, 2026 - 17:30 euvd
EUVD-2026-17977
Analysis Generated
Apr 01, 2026 - 17:30 vuln.today
CVE Published
Apr 01, 2026 - 17:02 nvd
HIGH 7.7

DescriptionGitHub Advisory

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.11, there is a broken access control vulnerability in tool values. This issue has been patched in version 0.8.11.

AnalysisAI

Broken access control in Open WebUI allows authenticated users to access tool values across tenant boundaries, exposing sensitive information from other users' AI tool configurations. The vulnerability affects self-hosted Open WebUI instances prior to version 0.8.11. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to Open WebUI
Exploit
Access tool values endpoint
Execution
Bypass access controls
Impact
Retrieve confidential tool configuration data
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Vulnerability AssessmentAI

Exploitation Requires authenticated access to Open WebUI versions prior to 0.8.11. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS score of 7.7 reflects genuine risk driven by high confidentiality impact (C:H) with changed scope (S:C), indicating tenant isolation failure. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated attacker with low-privilege access to a shared Open WebUI instance enumerates tool configurations beyond their authorized scope. By exploiting the broken access control, they retrieve tool values containing API keys, authentication tokens, or integration credentials configured by other users or tenants. …
Remediation Upgrade Open WebUI to version 0.8.11 or later, which contains the patch for this broken access control vulnerability. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all Open WebUI instances in your environment and document their current versions. …

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EUVD-2026-17977 vulnerability details – vuln.today
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