Critical · published March 30, 2023
🔥 A sneaky gap in Nextcloud's workflow allows any user to create admin-level operations, potentially leading to remote code execution. 😱 Think of it like a hotel where any guest can unlock the staff-only areas because no one checked their keycards — a serious oversight! When users can run scripts that should be reserved for admins, it’s like handing out the master key to the entire building. An attacker could exploit this vulnerability to execute arbitrary code on the server, meaning they could generate PDFs, invoke webhooks, or run any scripts with full administrative privileges. This could lead to unauthorized access, data theft, or even complete server takeover — absolutely devastating!
Think of it like a hotel where any guest can unlock the staff-only areas because no one checked their keycards — a serious oversight! When users can run scripts that should be reserved for admins, it’s like handing out the master key to the entire building. Nextcloud's missing scope validation in the workflow feature allows users to create workflows meant for administrators. If these workflows invoke scripts, they can lead to remote code execution depending on the available apps.
An attacker could exploit this vulnerability to execute arbitrary code on the server, meaning they could generate PDFs, invoke webhooks, or run any scripts with full administrative privileges. This could lead to unauthorized access, data theft, or even complete server takeover — absolutely devastating! Upgrade to Nextcloud Server version 24.0.10 or 25.0.4 immediately. If an upgrade isn’t possible right now, disable the `workflow_scripts` and `workflow_pdf_converter` apps as a temporary measure to keep your system secure. You've got this! By following these steps, you’ll strengthen your Nextcloud security and keep your data safe. 🛡️