Incorrect Authorization Affecting authlib package, versions [,1.6.12)[1.7.0, 1.7.1)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PYTHON-AUTHLIB-16643257
- published13 May 2026
- disclosed13 May 2026
- creditYo Iida
Introduced: 13 May 2026
CVE-2026-44681 (opens in a new tab)How to fix?
Upgrade authlib to version 1.6.12, 1.7.1 or higher.
Overview
authlib is a library in building OAuth and OpenID Connect servers.
Affected versions of this package are vulnerable to Incorrect Authorization via the validate_authorization_request function. An attacker can cause the server to redirect users to arbitrary URLs by submitting a crafted authorization request that omits the required scope and supplies a malicious redirect_uri parameter. This can be exploited to facilitate phishing attacks or credential harvesting by leveraging the trust of the legitimate server's domain.
Workaround
This vulnerability can be mitigated by unregistering the affected grant types if Implicit and Hybrid flows are not required, or by placing a reverse proxy in front of the authorization endpoint to reject requests containing both a redirect_uri parameter and a scope that does not include the required value when the response type matches the vulnerable set.