Adobe has released emergency security updates for Flash Player to address critical vulnerabilities that may open the door to a system breach.

Version 21.0.0.182 is crucial for users of basically any PC or mobile device, and should be downloaded immediately. The patch, according to the BBC, fixes 23 holes in the Windows, Mac, Linux, ChromeOS, Android, and iOS.

Adobe has, however, admitted that one exploit (CVE-2016-1010) is already in the wild, "being used in limited, targeted attacks." The company did not immediately respond to PCMag's request for comment.

In July, Flash Player was patched after a Hacking Team breach left the program vulnerable to attack. Mozilla later moved to block all versions of Flash in Firefox "by default," until Adobe released a more stable version.

Facebook in December jumped on the bandwagon, ditching Flash-based video players in favor of HTML5, a more secure framework. The social network followed Vimeo, Netflix, YouTube, and Twitch in making the switch.

Tech titan Google, which teamed up with Adobe last year to intelligently pause non-essential Flash content to preserve your computer battery, recently announced its own plan for display ads to go 100 percent HTML5.

Adobe may be down, but it's not out: Late last year, the company unveiled its intention to rename the Flash Professional CC program to Animate CC, expected to arrive sometime this year.

"While standards like HTML5 will be the Web platform of the future across all devices, Flash continues to be used in key categories like Web gaming and premium video, where new standards have yet to fully mature," Adobe said in a December statement.

This article originally appeared on PCMag.com.

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