Yesterday, Adobe announced an update for Flash that fixes specific security issues that are currently being exploited on the web.
Anyone who uses Flash should install the update as soon as possible.
The new version for Windows XP, Vista and 7 is 11.5.502.149. The new version for Windows 8 (available as an update from Microsoft) is 11.3.379.14.
Ars Technica has additional details.
Rants and musings on topics of interest. Sometimes about Windows, Linux, security and cool software.