Medium severity · published May 27, 2026
CVE-2026-44681
Authlib: Open Redirect in Authlib OIDC Implicit/Hybrid Authorization
6.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AU
authlib · authlib
< 1.6.12; >= 1.7.0, < 1.7.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44681
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44681
Exploit
https://github.com/authlib/authlib/security/advisories/GHSA-r95x-qfjj-fjj2
More from authlib
9.8
CVE-2026-104056
Authlib version 1.7.2 and below contains a vulnerability where discovery JSON metadata is cached without validation or issuer-origin binding
9.8
CVE-2026-96760
Authlib library contains a signature‑verification bypass vulnerability
9.8
CVE-2026-28802
Authlib: Setting `alg: none` and a blank signature appears to bypass signature verification
9.1
CVE-2026-27962
Authlib JWS JWK Header Injection: Signature Verification Bypass
8.8
CVE-2026-116672
Authlib RFC 7592 examples omit registration-access-token client binding