CVE-2026-96760

critical

Description

Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and without requiring a cryptographic key.

References

https://kb.cert.org/vuls/id/762428

https://www.kb.cert.org/vuls/id/762428

https://github.com/authlib/authlib/security/advisories/GHSA-6v38-4h7w-rj9h

https://github.com/authlib/authlib/releases/tag/v1.9.0

https://github.com/authlib/authlib/pull/938

https://github.com/authlib/authlib/commit/6c11a02da8730914cea08ec195f1108a40dc6733

https://github.com/authlib/authlib

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-88465

Details

Source: Mitre, NVD

Published: 2026-09-28

Updated: 2026-10-01

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.00383