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CVE-2026-41479— Authlib OAuth 2.0 authorization endpoint open redirects to attacker-controlled redirect_uri on unsupported response_type

Quick assessment

Affected
authlib authlib
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Authlib是Authlib组织开源的一个构建 OAuth 和 OpenID Connect 服务器的终极 Python 库。 Authlib 1.6.10之前版本和1.7.0版本存在输入验证错误漏洞，该漏洞源于OAuth 2.0授权端点在使用不支持的response_type并提供攻击者控制的redirect_uri时，可被用作未经身份验证的开放重定向。

CVSS 5.4 · Medium EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 2

VendorProduct Version RangeStatus
authlib authlib < 1.6.10 affected
= 1.7.0 affected
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I. Basic Information for CVE-2026-41479

Vulnerability Information
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Vulnerability Title
Authlib OAuth 2.0 authorization endpoint open redirects to attacker-controlled redirect_uri on unsupported response_type
Source: CVE Program / CVE List V5
Vulnerability Description
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.10 and 1.7.1, Authlib's OAuth 2.0 authorization endpoint can be turned into an unauthenticated open redirect when a request uses an unsupported response_type and supplies an attacker-controlled redirect_uri. The vulnerable behavior happens before client lookup and before any redirect URI validation. As a result, an attacker does not need a valid client registration, an authenticated user, or any prior state. A single request to the authorization endpoint is enough to obtain a 302 Location response to an arbitrary attacker-controlled URL. This vulnerability is fixed in 1.6.10 and 1.7.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Authlib 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Authlib是Authlib组织开源的一个构建 OAuth 和 OpenID Connect 服务器的终极 Python 库。 Authlib 1.6.10之前版本和1.7.0版本存在输入验证错误漏洞，该漏洞源于OAuth 2.0授权端点在使用不支持的response_type并提供攻击者控制的redirect_uri时，可被用作未经身份验证的开放重定向。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
authlib authlib < 1.6.10 -

II. Public POCs for CVE-2026-41479

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III. Intelligence Information for CVE-2026-41479

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Patches & Fixes for CVE-2026-41479 (1)

Vendor Advisories for CVE-2026-41479 (1)

IV. Related Vulnerabilities

Same product: authlib
Same vendor: authlib
Same weakness: CWE-601

V. Comments for CVE-2026-41479

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