Apache Kafka
Monthly
Apache Kafka 4.1.0 and 4.1.1 accept forged JWT tokens without signature validation, allowing remote unauthenticated attackers to authenticate as any user and gain unauthorized access to Kafka resources. The default SASL/OAUTHBEARER validator (DefaultJwtValidator) fails to verify token signatures, issuers, or audiences, enabling complete authentication bypass. CVSS 9.1 (Critical) with network vector and no privileges required. SSVC indicates the vulnerability is automatable with partial technical impact. No active exploitation confirmed at time of analysis, but the attack requires minimal sophistication and could be scripted trivially given the token acceptance behavior.
Apache Kafka 4.1.0 and 4.1.1 accept forged JWT tokens without signature validation, allowing remote unauthenticated attackers to authenticate as any user and gain unauthorized access to Kafka resources. The default SASL/OAUTHBEARER validator (DefaultJwtValidator) fails to verify token signatures, issuers, or audiences, enabling complete authentication bypass. CVSS 9.1 (Critical) with network vector and no privileges required. SSVC indicates the vulnerability is automatable with partial technical impact. No active exploitation confirmed at time of analysis, but the attack requires minimal sophistication and could be scripted trivially given the token acceptance behavior.