The Australian Cyber Security Centre has issued an alert about a global campaign that is actively exploiting vulnerable content management systems and their plugins, as reported by BleepingComputer.

Content management platforms and their plugin ecosystems are perennial targets for a simple reason. There are millions of installs, many run by small organizations without dedicated security staff, and the plugins that add functionality also add attack surface that is often left unpatched. A single widely used vulnerable plugin can open thousands of sites at once.

A compromised website is rarely the end goal in itself. It becomes a host for phishing pages, a delivery point for malware, a relay that hides an attacker's traffic, or a foothold into whatever business sits behind it. National alerts like this usually mean the exploitation is already broad enough to be measured.

The defense is unglamorous and effective. Keep the core platform and every plugin updated, remove plugins you no longer use, put the admin interface behind strong authentication, and monitor for the unexpected files and accounts that follow a web compromise. On the public web, an unpatched plugin is an open invitation.

Sources: BleepingComputer; Australian Cyber Security Centre.