CVE-2026-18691

The CVE describes a vulnerability in MongoDB Server’s intra-cluster connection setup where an attacker with network access can influence the authentication mechanism used when one replica set member connects to another. Under certain conditions, the shared internal credential may be transmitted i...

CVE-2026-18691 Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure

An issue in MongoDB Server's intra-cluster connection setup could allow a party with suitable network access to influence which authentication mechanism is used when one replica set member connects to another. Under certain conditions, this could cause the cluster's shared internal credential to ...

Improper Certificate Validation

Apache Pulsar is vulnerable to improper certificate validation. The vulnerability exists due to man in the middle attacks in intra-cluster connections and geo-replication connections which allows an attacker to take control of a machine between the client and the server...