Vulnerability-Lookup

CVE-2026-70665 (GCVE-0-2026-70665)

Vulnerability from cvelistv5 – Published: 2026-08-25 22:09 – Updated: 2026-08-27 14:34

Title

Doorkeeper OpenID Connect: DCR endpoint persists unvalidated client-supplied scopes

Summary

Doorkeeper OpenID Connect implements an OpenID Connect authentication provider for Rails applications on top of Doorkeeper. Prior to 1.10.4, the Dynamic Client Registration (DCR) endpoint persists client-supplied scopes without validating them against the server's configured scope set. Under certain conditions, this allows a self-registered client to obtain scopes beyond what the server intended to grant. In DynamicClientRegistrationController#application_params, the scopes attribute is assigned directly from params[:scope] with no validation against Doorkeeper.configuration.scopes or optional_scopes. Combined with enforce_configured_scopes being off by default and Doorkeeper's ScopeChecker prioritizing application-level scopes over server-level scopes, this creates a privilege escalation path. This issue is fixed in version 1.10.4.

Severity

4.2 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-27 13:52 UTC

CWE

CWE-285 - Improper Authorization

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/doorkeeper-gem/doorkeeper-open…	x_refsource_CONFIRM
https://github.com/doorkeeper-gem/doorkeeper-open…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
doorkeeper-gem	doorkeeper-openid_connect	Affected: < 1.10.4	guessed

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-70665",
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FKIE_CVE-2026-70665

Vulnerability from fkie_nvd - Published: 2026-08-25 23:17 - Updated: 2026-08-27 17:19

Severity

4.2 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/doorkeeper-gem/doorkeeper-openid_connect/commit/24c3cb1729b69f48649a6f4491dcae69f805000d
	security-advisories@github.com	https://github.com/doorkeeper-gem/doorkeeper-openid_connect/security/advisories/GHSA-8r7r-wh7x-27ff

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "doorkeeper-openid_connect",
          "vendor": "doorkeeper-gem",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.10.4"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Doorkeeper OpenID Connect implements an OpenID Connect authentication provider for Rails applications on top of Doorkeeper. Prior to 1.10.4, the Dynamic Client Registration (DCR) endpoint persists client-supplied scopes without validating them against the server\u0027s configured scope set. Under certain conditions, this allows a self-registered client to obtain scopes beyond what the server intended to grant. In DynamicClientRegistrationController#application_params, the scopes attribute is assigned directly from params[:scope] with no validation against Doorkeeper.configuration.scopes or optional_scopes. Combined with enforce_configured_scopes being off by default and Doorkeeper\u0027s ScopeChecker prioritizing application-level scopes over server-level scopes, this creates a privilege escalation path. This issue is fixed in version 1.10.4."
    }
  ],
  "id": "CVE-2026-70665",
  "lastModified": "2026-08-27T17:19:43.340",
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        "cvssData": {
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          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
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          "userInteraction": "REQUIRED",
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          "version": "3.1"
        },
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        "impactScore": 2.5,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
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    "ssvcV203": [
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  "published": "2026-08-25T23:17:58.933",
  "references": [
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-70665 (GCVE-0-2026-70665)

FKIE_CVE-2026-70665

Tags

Sightings

Nomenclature