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CVE-2026-44681

Authlib: Open Redirect in Authlib OIDC Implicit/Hybrid Authorization

Published: May 27, 2026Updated: May 27, 2026 Sources: CVE List
NVD MITRE
6.1CVSS
MEDIUM

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None

Weaknesses

CWE-601CWE-601: URL Redirection to Untrusted Site ('Open Redirect')CWE-863CWE-863: Incorrect Authorization

Affected Products

authlib
authlib

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

3 techniques
Initial Access
View detailed technique mapping

References

https://github.com/authlib/authlib/security/advisories/GHSA-r95x-qfjj-fjj2
github.com

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