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

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

Details

Source: Mitre, NVD

Published: 2026-09-28

Updated: 2026-09-30

Risk Information

CVSS v2

Base Score: 7.5

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

Severity: High

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: 0.00125