A famous Windows XP product key was leaked before the operating system's official release, according to the Polish technology site dobreprogramy. The outlet reports that Microsoft was unable to stop the leak. The report was published on September 19, 2026.
The key in question is widely known among users of the operating system. According to dobreprogramy, it spread ahead of the launch, meaning it was already in circulation before Microsoft made Windows XP available to the public.
The report describes Microsoft as powerless in the face of the leak. It does not detail how the key got out or what steps, if any, the company took in response.
Windows XP became one of Microsoft's most recognizable releases, and its activation system was meant to tie each installation to a valid key. A key that leaked early would have undermined that check from the start.
The material available does not include the key itself, the exact date it surfaced, or any statement from Microsoft. Those details are absent from the reporting summarized here.
What to watch next: whether Microsoft or the original outlet provides further detail on how the key escaped and when it first appeared.
