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CVE-2026-114618

6.8 · MEDIUM

Authlib is a Python library which builds OAuth and OpenID Connect servers.

Published Oct 22, 2026authlibCWE-287EPSS 0.35%

Overview

CVE-2026-114618 is a medium-severity vulnerability affecting authlib authlib. It was published on October 22, 2026 and has a CVSS 3.1 base score of 6.8 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, the default RFC 7523 JWTBearerGrant.get_audiences() returns an empty list, causing JWTBearerGrant.verify_claims() to require only that an aud claim exists without matching the current authorization server. An attacker holding a legitimate assertion for another service can present it to a server that shares the signing key and uses the default grant, obtaining an access token across a trust boundary. Implementations that override get_audiences() with the server's valid audience identifiers are not affected. This issue is fixed in version 1.9.0.

Remediation

Check the references section for vendor advisories and patches from authlib. Update authlib to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
authlibauthlib>= 0, < 1.9.0Affected

References

GitHubgithub.com/authlib/authlib/commit/e3bd41cb29dcfee434453b135ffb487884baeedfGitHubgithub.com/authlib/authlib/pull/945GitHubgithub.com/authlib/authlib/releases/tag/v1.9.0GitHubgithub.com/authlib/authlib/security/advisories/GHSA-fch4-3c6x-j4gcGitHubgithub.com/authlib/authlib/security/advisories/GHSA-fch4-3c6x-j4gc

How CyberStrike helps

Frequently asked questions

What is CVE-2026-114618?

CVE-2026-114618 is a medium-severity vulnerability affecting authlib authlib. It was published on October 22, 2026 and has a CVSS 3.1 base score of 6.8 (MEDIUM).

How severe is CVE-2026-114618?

This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-114618?

Check the references section for vendor advisories and patches from authlib. Update authlib to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-114618?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-114618 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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