CVE-2026-70665Public exploitNetwork attack vectorHinoki check available

Privilege escalation via unvalidated DCR scopes

Published Aug 25, 2026 · Updated Aug 25, 2026

Improper authorization in Doorkeeper OpenID Connect before 1.10.4 allows remote attackers to claim unintended OAuth scopes through DCR. DynamicClientRegistrationController#application_params assigns params[:scope] directly to application scopes without checking configured or optional scopes. Exploitation requires mounted DCR routes, open self-registration, disabled configured-scope enforcement and meaningful server scopes; the client can present unintended privileges at consent.

CVSS severity4.8
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper authorization in Doorkeeper OpenID Connect before 1.10.4 allows remote attackers to claim unintended OAuth scopes through DCR. DynamicClientRegistrationController#application_params assigns params[:scope] directly to application scopes without checking configured or optional scopes. Exploitation requires mounted DCR routes, open self-registration, disabled configured-scope enforcement and meaningful server scopes; the client can present unintended privileges at consent.

The record

CVE
CVE-2026-70665
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
Doorkeeper
Product
Doorkeeper OpenID Connect
Classifications
CWE-285
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=< 1.10.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Doorkeeper · Doorkeeper OpenID Connectversion=< 1.10.4

Published CVSS scores

4.8GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/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.

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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-285Improper Authorization

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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