Vulnerability · Published May 27, 2026 · Assigned by GitHub_M
CVE-2026-44681Authlib: Open Redirect in Authlib OIDC Implicit/Hybrid Authorization
Medium 6.1
In plain English
A medium-severity open redirect in authlib from authlib. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.12 and 1.7.1, an unauthenticated open redirect in Authlib's OpenIDImplicitGrant and OpenIDHybridGrant authorization endpoint lets a remote attacker cause the authorization server to issue an HTTP 302 to an attacker-chosen URL by submitting an authorization request that omits the openid scope. This vulnerability is fixed in 1.6.12 and 1.7.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | python-authlib | 1.2.0-1+deb12u2 | DEBIAN-CVE-2026-44681 |
| Debian:13 | python-authlib | no fix listed | DEBIAN-CVE-2026-44681 |
| Debian:14 | python-authlib | 1.7.2-1 | DEBIAN-CVE-2026-44681 |
| PyPI | authlib | 1.7.1 | GHSA-r95x-qfjj-fjj2 |
| PyPI | authlib | 1.6.12 | GHSA-r95x-qfjj-fjj2 |
| PyPI | authlib | 1.6.12 | PYSEC-2026-188 |
| Ubuntu:25.10 | python-authlib | no fix listed | UBUNTU-CVE-2026-44681 |
| Ubuntu:26.10 | python-authlib | no fix listed | UBUNTU-CVE-2026-44681 |
Affected products (as reported)
Weakness: CWE-601, CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References
- https://github.com/authlib/authlib/security/advisories/GHSA-r95x-qfjj-fjj2 x_refsource_CONFIRM