CVE-2023-51774: JSON-Jwt Project JSON-Jwt

High severity, CVSS 8.4. EPSS: 0.2% chance of exploitation in the next 30 days.

The json-jwt (aka JSON::JWT) gem 1.16.3 for Ruby sometimes allows bypass of identity checks via a sign/encryption confusion attack. For example, JWE can sometimes be used to bypass JSON::JWT.decode.

Affected products

• JSON-Jwt Project JSON-Jwt: version 1.16.3 only

Published 2024-02-29. Last modified 2026-06-17.