Authlib RFC 7592 範例遺漏註冊存取權杖客戶端繫結，CVE-2026-116672
CVE-2026-116672 - Authlib RFC 7592 examples omit registration-access-token client binding
Authlib 的 RFC 7592 範例在 0.15 至 1.9.1 之間，未正確驗證客戶端存取權杖，導致任何持有有效註冊存取權杖的客戶端可讀取、修改或刪除其他客戶端的註冊資訊。
此漏洞允許持有有效註冊存取權杖的任何客戶端，讀取或修改他人註冊資訊，對 OAuth 伺服器安全構成重大威脅，提醒開發者即時升級至 1.9.1 以防範。
Authlib 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.
Impact
Affected Products
The following products are affected by CVE-2026-116672
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
| ID | Vendor | Product | Action |
|---|---|---|---|
| 1 | Authlib | authlib |
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] |
Update Authlib to version 1.9.1 or later to fix client registration authorization flaws.
- Update Authlib to version 1.9.1 or later.
- Verify access controls for client registrations.
- Review existing client configurations.
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CVE-2026-116672.
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The following table lists the changes that have been made to the
CVE-2026-116672 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by [email protected]
十月. 27, 2026
Action Type Old Value New Value Added Description Authlib 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-1188 Added CWE CWE-639 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/116xxx/CVE-2026-116672.json">CVE-2026-116672</a> Added Reference https://github.com/authlib/authlib/commit/1bd2a313492ce0a4d0571c150730907aa3fc91ff Added Reference https://github.com/authlib/authlib/releases/tag/v1.9.1 Added Reference https://github.com/authlib/authlib/security/advisories/GHSA-c73q-w75p-j82v
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.