Dynamic Security Plugin Vulnerability in Eclipse Mosquitto

CVE-2021-34434

What is CVE-2021-34434?

In versions 2.0 to 2.0.11 of Eclipse Mosquitto, a flaw exists in the dynamic security plugin. When a client's ability to subscribe to a topic is revoked while the client is offline, any existing subscriptions for that client are not correctly retracted. This oversight may lead to unauthorized access or message delivery to unintended clients, posing a risk to the integrity of the messaging system.

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