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Vulnerability · Published Sep 9, 2026 · Assigned by GitHub_M

CVE-2026-87016Open WebUI: Sign-in as another user via wildcard characters in the OAuth subject claim on SQLite

High 8.1

In plain English

A high-severity improper authentication in open-webui from open-webui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.6%top 51.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.41 until 0.11.1, get_user_by_oauth_sub and get_user_by_scim_external_id in backend/open_webui/models/users.py used JSON contains matching that compiled to SQL LIKE substring matching on SQLite. An OAuth subject containing percent or underscore wildcard characters could resolve to a different stored identity, potentially selecting an administrator account and issuing the attacker that account's session; PostgreSQL deployments were not affected. This issue is fixed in version 0.11.1.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIopen-webui0.11.1GHSA-wpmr-8h3q-fwj7
PyPIopen-webui0.11.1PYSEC-2026-4128

Affected products (as reported)

VendorProductVersions
open-webui open-webui >= 0.6.41, < 0.11.1

Weakness: CWE-155, CWE-287 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References