Authlib RFC 7592 examples omit registration-access-token client binding

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-116672
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-27 17:16:59 UTC
Updated2026-10-27 21:31:20 UTC
DescriptionAuthlib is a Python library which builds OAuth and OpenID Connect servers. From 0.15 until 1.9.1, the documented ClientConfigurationEndpoint.authenticate_client and ClientConfigurationEndpoint.check_permission reference implementations look up a target client from request-controlled client_id data and check only whether that target is editable, without verifying that request.credential belongs to the target client. Deployments following both examples can allow a client holding any valid registration access token to read, modify, or delete another client's registration. Changing redirect_uris can enable authorization code or token interception, while deleting registrations can deny service to affected clients. This issue is fixed in version 1.9.1.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

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

EPSS: 0.002740000 probability, percentile 0.197600000 (date 2026-10-28)

Problem Types: CWE-639 | CWE-1188 | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key | CWE-1188 CWE-1188: Insecure Default Initialization of Resource

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Authlib Authlib affected >= 0.15, < 1.9.1 Not specified

References

ReferenceSourceLinkTags
github.com/authlib/authlib/commit/1bd2a313492ce0a4d0571c150730907aa3fc91ff [email protected] github.com
github.com/authlib/authlib/releases/tag/v1.9.1 [email protected] github.com
github.com/authlib/authlib/security/advisories/GHSA-c73q-w75p-j82v [email protected] github.com
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