If you use a web browser with Flash enabled, you should stop what you’re doing and update Flash.

According to the associated Adobe security bulletin, Flash 21.0.0.182 fixes twenty-three security vulnerabilities, including one (CVE-2016-1010) that is being actively exploited on the web.

The release notes for Flash 21.0.0.182 provide additional details. The new version fixes several bugs that are unrelated to security, and adds some new features.

As usual, Chrome will update itself with the new version of Flash, and Internet Explorer and Edge on newer versions of Windows will be updated via Windows Update.