Improper verification of cryptographic signature in authlib - CVE-2026-96760
Published: September 29, 2026
Vulnerability identifier: #VU152754
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-96760
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to forge arbitrary authenticated payloads.
The vulnerability exists due to improper verification of cryptographic signatures in the Authlib JsonWebSignature.deserialize_json() function when processing JWS general JSON serialization objects. A remote attacker can submit a JWS object with an empty signatures array to forge arbitrary authenticated payloads.
Affected software
authlib
How to mitigate CVE-2026-96760
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.