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Vulnerability · Published Sep 9, 2026 · Assigned by GitHub_M

CVE-2026-87998Open WebUI: Non-admin users can delete admin-owned external knowledge connections via knowledge base deletion

High 7.1

In plain English

A high-severity privilege mismanagement in open-webui from open-webui. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.1High
Exploit odds (30 days)0.5%top 58.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIopen-webui0.11.1GHSA-2724-6cpj-gf3v
PyPIopen-webui0.11.1PYSEC-2026-4115

Affected products (as reported)

VendorProductVersions
open-webui open-webui >= 0.10.0, < 0.11.1

Weakness: CWE-269, CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

References