Jabberd2

Jabberd2 is a niche open-source XMPP server implementation that, despite limited product scope, occupies a prominent position in federated instant-messaging infrastructures where it handles user authentication, message routing, and server-to-server communication. Its vulnerabilities skew toward serious outcomes with a meaningful share reaching critical severity, and recur through permission and authentication weaknesses—including incorrect permission assignment, authentication bypass, sensitive information exposure, and XML entity expansion—that reflect the authentication and protocol-parsing demands of a messaging server. Defenders running Jabberd2 should prioritize patching high-severity disclosures, particularly those affecting authentication and access control; current severity and exposure counts are shown alongside this summary.