CVEvulnerability

CVE-2026-114614

3.5 LOW Published 2026-10-22 Modified 2026-10-29 Official page ↗
Status
Analyzed
Published
2026-10-22
Last modified
2026-10-29
Assigner
[email protected]
CVSS 3.1 ([email protected])
2.6 LOW — CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
CVSS 3.1 ([email protected])
3.5 LOW — CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
Weaknesses
CWE-601, CWE-693

Description

Authlib is a Python library which builds OAuth and OpenID Connect servers. From 0.13 until 1.8.0, authlib.common.security.is_secure_transport() uses a textual prefix comparison for loopback HTTP exemptions, so a URL whose userinfo begins with a loopback host can be accepted even when its parsed host is an external non-loopback system. An external party able to supply a URL to OIDC RP-Initiated Logout registration, authorization-server metadata validation, or another call site can bypass the TLS-required guard and cause cleartext redirection or acceptance of cleartext endpoints. The issue does not bypass redirect URI exact matching and does not by itself forge tokens or authenticate users. The vulnerable authlib.common.security.is_secure_transport() implementation in authlib/common/security.py misinterprets the userinfo component before OIDC RP-Initiated Logout dynamic client registration and other consumers enforce transport security. This issue is fixed in version 1.8.0.

Affected configurations

• authlib authlib (>= 0.13 < 1.8.0)

Related

Weakness · CWE (2)

  • CWE-601 URL Redirection to Untrusted Site weakness
  • CWE-693 Protection Mechanism Failure weakness

References