CVE-2026-87998 Open WebUI - Broken Access Control

Open WebUI 0.10.0 to 0.11.1 contains a broken access control vulnerability caused by missing administrator checks in DELETE /api/v1/knowledge/{id}/delete, letting non-administrator users with write access delete shared external connections, exploit requires write access to one external knowledge base.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Required
EPSS
0.49% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Denial Of Service, Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Published
9 September 2026
Updated
15 October 2026
Weakness
CWE-269

Vendor fix

Upgrade to version 0.11.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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