SPAIN-TELECOM-MOBILE-WORLD-CONGRESS
A woman looks at her mobile phone as she stands in front of a poster of Mozilla Firefox on February 27, 2013 at the Mobile World Congress, the world's biggest mobile fair, in Barcelona.  Photograph by Josep Lago — AFP/Getty Images

If you use Firefox, you should update right away

Aug 07, 2015

If you use Firefox, you could be at risk because of a flaw in the software that could be used to steal files from your computer.

In a blog post published Thursday, Mozilla explained: "A Firefox user informed us that an advertisement on a news site in Russia was serving a Firefox exploit that searched for sensitive files and uploaded them to a server that appears to be in Ukraine."

"The vulnerability comes from the interaction of the mechanism that enforces JavaScript context separation (the “same origin policy”) and Firefox’s PDF Viewer," Mozilla said. "Products that don’t contain the PDF Viewer, such as Firefox for Android, are not vulnerable," the post continued.

Not to worry though, as Mozilla has already released an update to fix the problem.

All products and services featured are based solely on editorial selection. FORTUNE may receive compensation for some links to products and services on this website.

Quotes delayed at least 15 minutes. Market data provided by Interactive Data. ETF and Mutual Fund data provided by Morningstar, Inc. Dow Jones Terms & Conditions: http://www.djindexes.com/mdsidx/html/tandc/indexestandcs.html. S&P Index data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. Terms & Conditions. Powered and implemented by Interactive Data Managed Solutions