The “PrintNightmare” security vulnerability is tied into Windows’ Print Spooler service, which runs by default, and grants attackers remote system privileges across all versions of Windows. This access makes it possible for nefarious actors to install their own programs, create new system accounts, and view/copy/alter data.
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Microsoft initially released a statement of mitigation measures you could take, as documented by Bleeping Computer, in order to temporarily reduce the threat. Now, it’s moved on to releasing patches for all affected versions of Windows in order to remove the vulnerability entirely. Not all of the affected versions have been patched yet, but Microsoft states that anything that hasn’t been patched prior to July 6 will be updated “shortly.”