Authlib: is_secure_transport() loopback exemption can be bypassed with a userinfo component, allowing cleartext-HTTP URLs to non-loopback hosts
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
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| authlib | authlib | affected |
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| Authlib | Authlib |
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| Source | ID | Title |
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Github GHSA |
GHSA-jj7h-c3hg-m23x | Authlib: is_secure_transport() loopback exemption can be bypassed with a userinfo component, allowing cleartext-HTTP URLs to non-loopback hosts |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.273% probability within 30 days)
| Type | Values Removed | Values Added |
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| CPEs | cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:* |
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| Metrics |
ssvc
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| Type | Values Removed | Values Added |
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| Weaknesses | CWE-319 | |
| References |
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| Metrics |
threat_severity
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threat_severity
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| Type | Values Removed | Values Added |
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| First Time appeared |
Authlib
Authlib authlib |
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| Vendors & Products |
Authlib
Authlib authlib |
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| 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. | |
| Title | Authlib: is_secure_transport() loopback exemption can be bypassed with a userinfo component, allowing cleartext-HTTP URLs to non-loopback hosts | |
| Weaknesses | CWE-601 CWE-693 |
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| References |
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| Metrics |
cvssV3_1
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