CVE-2026-44681: authlib Open Redirect

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.

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CVSS v3.1 Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0018

Probability of exploitation

0.08%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-601 CWE-601

CWE-863 Incorrect Authorization

Affected Products

Vendor	Product	Versions
authlib	authlib	< 1.6.12
authlib	authlib	All

References

Advisories & Patches

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

Exploits

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

Frequently Asked Questions

What is CVE-2026-44681? +

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. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2026-44681? +

CVE-2026-44681 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0018, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-44681? +

CVE-2026-44681 affects products from authlib, specifically: authlib. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-44681? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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