VULNERABILITY INTELLIGENCE

CVE-2025-51606

CVSS score8.8 HIGH

EPSS probability0.35%

CISA KEVNot currently listed

Published2025-08-21

Last modified2026-06-17

Description

hippo4j 1.0.0 to 1.5.0, uses a hard-coded secret key in its JWT (JSON Web Token) creation. This allows attackers with access to the source code or compiled binary to forge valid access tokens and impersonate any user, including privileged ones such as "admin". The vulnerability poses a critical security risk in systems where authentication and authorization rely on the integrity of JWTs.