CVE-2026-87016Public exploitNetwork attack vector

Account takeover via wildcard identity matching

Published Sep 9, 2026 · Updated Sep 9, 2026

Authentication bypass in Open WebUI 0.6.41 through 0.11.0 allows attackers to receive another user's session via identity lookup. The SQLite branches of get_user_by_oauth_sub and get_user_by_scim_external_id apply JSON contains(), which compiles to SQL LIKE substring matching and treats percent and underscore in identity values as wildcards. Exploitation requires SQLite plus OAuth, OIDC, or SCIM; deliberate account takeover further requires control of the matched claim, while underscore collisions can bind a sign-in to the first matching account.

CVSS severity8.1
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Open WebUI 0.6.41 through 0.11.0 allows attackers to receive another user's session via identity lookup. The SQLite branches of get_user_by_oauth_sub and get_user_by_scim_external_id apply JSON contains(), which compiles to SQL LIKE substring matching and treats percent and underscore in identity values as wildcards. Exploitation requires SQLite plus OAuth, OIDC, or SCIM; deliberate account takeover further requires control of the matched claim, while underscore collisions can bind a sign-in to the first matching account.

The record

CVE
CVE-2026-87016
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
Open WebUI
Product
Open WebUI
Classifications
CWE-155, CWE-287, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.6.41, < 0.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open WebUI · Open WebUIversion=>= 0.6.41, < 0.11.1

Published CVSS scores

8.1GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-155Improper Neutralization of Wildcards or Matching Symbols
CWE-287Improper Authentication
T1078Valid Accounts

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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