Hackers Backdoor Nextcloud Servers Through Critical Flaw in Collabora’s Built-in CODE App
The Hacker News · Oct 14, 2026
Attackers exploited a flaw in an optional Nextcloud app, Collabora Online - Built-in CODE Server, to plant web shells on Nextcloud servers. Three administrators reported the issue on GitHub, with the first logged attack on September 10. A web shell is a small file that executes any command an attacker sends via a web request, with the rights of the web server account. The flaw
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