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CVE-2026-41479

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 5.4 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • authlib

    Versions
    • < 1.6.10: Affected
    • = 1.7.0: Affected

    No fix published

  • python-authlib Debian:13

    Versions
    • 1.6.0-1
    • 1.6.0-1+deb13u1
    • 1.6.1-1
    • 1.6.3-1
    • 1.6.4-1
    • 1.6.5-1
    • 1.6.6-1
    • 1.6.7-1
    • 1.6.8-1
    • 1.6.9-1
    • 1.7.0-1
    • 1.7.2-1
    • 1.7.2-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-authlib Debian:14

    Versions
    • 1.6.0-1
    • 1.6.1-1
    • 1.6.3-1
    • 1.6.4-1
    • 1.6.5-1
    • 1.6.6-1
    • 1.6.7-1
    • 1.6.8-1
    • 1.6.9-1
    • 1.7.0-1
    Affected ranges
    • ECOSYSTEM: < 1.7.2-1

    Update to 1.7.2-1

  • authlib PyPI

    Versions
    • 0.1
    • 0.10
    • 0.11
    • 0.12
    • 0.12.1
    • 0.13
    • 0.14
    • 0.14.1
    • 0.14.2
    • 0.14.3
    • 0.15
    • 0.15.1
    • 0.15.2
    • 0.15.3
    • 0.15.4
    • 0.15.5
    • 0.15.6
    • 0.1rc0
    • 0.2
    • 0.2.1
    • 0.3
    • 0.4
    • 0.4.1
    • 0.5
    • 0.5.1
    • 0.6
    • 0.7
    • 0.8
    • 0.9
    • 1.0.0
    • 1.0.0a1
    • 1.0.0a2
    • 1.0.0b1
    • 1.0.0b2
    • 1.0.0rc1
    • 1.0.1
    • 1.1.0
    • 1.2.0
    • 1.2.1
    • 1.3.0
    • 1.3.1
    • 1.3.2
    • 1.4.0
    • 1.4.1
    • 1.5.0
    • 1.5.1
    • 1.5.2
    • 1.6.0
    • 1.6.1
    • 1.6.2
    • 1.6.3
    • 1.6.4
    • 1.6.5
    • 1.6.6
    • 1.6.7
    • 1.6.8
    • 1.6.9
    Affected ranges
    • ECOSYSTEM: < 1.6.10

    Update to 1.6.10

  • authlib PyPI

    Versions
    • 1.7.0
    Affected ranges
    • ECOSYSTEM: ≥ 1.7.0, < 1.7.1

    Update to 1.7.1

  • python-authlib Ubuntu:Pro:22.04:LTS

    Versions
    • 0.15.4-1
    • 0.15.5-1
    • 0.15.5-1ubuntu0.1~esm1
    • 0.15.5-1ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-authlib Ubuntu:Pro:24.04:LTS

    Versions
    • 1.2.1-1
    • 1.3.0-1
    • 1.3.0-1ubuntu0.1~esm1
    • 1.3.0-1ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-authlib Ubuntu:25.10

    Versions
    • 1.5.1-1
    • 1.5.2-1
    • 1.6.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-authlib Ubuntu:26.10

    Versions
    • 1.6.7-1
    • 1.7.2-1
    • 1.7.2-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-authlib Ubuntu:Pro:26.04:LTS

    Versions
    • 1.6.0-1
    • 1.6.5-1
    • 1.6.6-1
    • 1.6.7-1
    • 1.6.7-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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