Medium
python-authlib — security advisory
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.
- Products
- python-authlib
- Affected versions
- 0.15.4-1, 0.15.5-1, 0.15.5-1ubuntu0.1~esm1, 0.15.5-1ubuntu0.1~esm2, 1.2.1-1, 1.3.0-1, 1.3.0-1ubuntu0.1~esm1, 1.3.0-1ubuntu0.1~esm2, 1.5.1-1, 1.5.2-1, 1.6.0-1, 1.6.5-1, 1.6.6-1, 1.6.7-1, 1.6.7-1ubuntu0.1~esm1, 1.7.2-1, 1.7.2-2
- Fixed versions
- Not specified
- CVEs
- CVE-2026-41479
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:11 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-41479
python-authlib
Fixed versions: Not specified
python-authlib
Fixed versions: Not specified
python-authlib
Fixed versions: Not specified
python-authlib
Fixed versions: Not specified
python-authlib
Fixed versions: Not specified
Complete source record
{
"id": "6f41e50f1ccfdb05e4693bb8cf1cccee8defbee896cbb8d912f02f1bc0a42703",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-41479",
"method": "structured",
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"summary": "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.",
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"modified": "2026-10-17T12:58:15.431923576Z",
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"references": [
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"https://www.cve.org/CVERecord?id=CVE-2026-41479",
"https://github.com/authlib/authlib/commit/3be08468201a7766a93012ce149ea12822cab096",
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"source_id": "core-osv",
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"published_at": "2026-06-22T21:16:00+00:00"
}