CVE-2026-70482Network attack vectorHinoki check available

Account takeover via unbound OAuth access tokens

Published Aug 4, 2026 · Updated Aug 4, 2026

Improper authentication in Open WebUI 0.8.0 and later, before 0.11.0 allows remote attackers to take over accounts via OAuth token exchange. The token_exchange handler submits a caller-supplied provider token to userinfo but never verifies the OAuth client that received it. Exploitation requires ENABLE_OAUTH_TOKEN_EXCHANGE=True and an access token for an existing user; the issued session inherits that user's role.

CVSS severity8.1
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper authentication in Open WebUI 0.8.0 and later, before 0.11.0 allows remote attackers to take over accounts via OAuth token exchange. The token_exchange handler submits a caller-supplied provider token to userinfo but never verifies the OAuth client that received it. Exploitation requires ENABLE_OAUTH_TOKEN_EXCHANGE=True and an access token for an existing user; the issued session inherits that user's role.

The record

CVE
CVE-2026-70482
Published
Aug 4, 2026
Updated
Aug 4, 2026
Vendor
Open WebUI
Product
Open WebUI
Classifications
CWE-287, T1550.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=>= 0.8.0, < 0.11.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open WebUI · Open WebUIversion=>= 0.8.0, < 0.11.0

Published CVSS scores

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

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1550.001Use Alternate Authentication Material: Application Access Token

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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