Microsoft warns of Windows ‘PrintNightmare’ vulnerability that’s being actively exploited

Microsoft warns of Windows ‘PrintNightmare’ vulnerability that’s being actively exploited


Illustration by Alex Castro / The Verge

Microsoft is warning Windows users about an unpatched critical flaw in the Windows Print Spooler service. The vulnerability, dubbed PrintNightmare, was uncovered earlier this week after security researchers accidentally published a proof-of-concept (PoC) exploit. While Microsoft hasn’t rated the vulnerability, it allows attackers to remotely execute code with system-level privileges, which is as critical and problematic as you can get in Windows.

Researchers at Sangfor published the PoC, in what appears to have been a mistake, or a miscommunication between the researchers and Microsoft. The test code was quickly deleted, but not before it had already been forked on GitHub.

Sangfor researchers had been planning to detail multiple 0-day…

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