CVE-2026-44681 | Authlib: Open Redirect in Authlib OIDC Implicit/Hybrid Authorization

Exp

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.

Published: 2026-05-27 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-44681 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.18%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2026-44681

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-44681

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.04% 0.18% +0.14%
2 2026-05-28 — 0.04% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-44681

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]

Weakness enumeration for CVE-2026-44681

GitHub Security Advisory for CVE-2026-44681

GHSA-r95x-qfjj-fjj2 · Severity: medium · Ecosystem: pip — Authlib OIDC Implicit/Hybrid Authorization Vulnerable to Open Redirect

OS Trackers for CVE-2026-44681

vendor priority summary link
debian not yet assigned CVE-2026-44681 not yet assigned priority: Debian including 1 source packages (python-authlib), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 3, resolved 2. https://security-tracker.debian.org/tracker/CVE-2026-44681
suse medium CVE-2026-44681 severity moderate: SUSE including 3 source package names (python311-Authlib-1.7.2-1.1, python313-Authlib-1.7.2-1.1, python314-Authlib-1.7.2-1.1), 3 product×package rows across 1 product lines (openSUSE Tumbleweed): Fixed 3. https://www.suse.com/security/cve/CVE-2026-44681/
ubuntu medium CVE-2026-44681 medium priority: Ubuntu including 1 source packages (python-authlib), 5 status rows across 5 suites (jammy, noble, questing, resolute, upstream): needs-triage 5. https://ubuntu.com/security/CVE-2026-44681

Affected software / configurations for CVE-2026-44681

Vendor Product Version Raw CPE
authlib authlib < 1.6.12 cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*
authlib authlib 1.7.0 cpe:2.3:a:authlib:authlib:1.7.0:*:*:*:*:*:*:*

References for CVE-2026-44681

cvelogic Threat Intelligence