A terminal running Nextcloud occ commands that show richdocumentscode going from 26.4.302, marked vulnerable, to 26.4.502, marked fixed

WarningAlerts14 Nov 2026 · 4 min read

Nextcloud’s Built-in CODE Server is being exploited: update or remove it

A command injection bug in the Collabora Online Built-in CODE Server app for Nextcloud was exploited in September and October 2026. Disabling the app doesn’t protect you. Update it to 26.4.303 or later, or remove it,…

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