A security initiative from Google hopes to identify and put a stop to previously unknown, unpatched bugs that threaten the Web at large.
Monthly security update addresses two dozen vulnerabilities, including one being exploited as part of the "Sandworm" cyberattack.
Computers infected with malware after visiting a "strategically important Web site," security firm FireEye warns.
In lieu of a fix, Microsoft offers workarounds to combat the bug that has left browser users open to attacks.
The flaw, which is being leveraged in "limited, targeted attacks," allows remote code execution, Microsoft warns.
Adobe and Microsoft patch a critical zero-day security flaw in Adobe's Flash Player that is actively being used to target Windows users, but the bug is different from an unpatched hole in Internet Explorer.
Google wants technology firms to cut down on the amount of time it takes to fix zero day vulnerabilities, but some are crying foul.
The company says two vulnerabilities are being actively exploited and recommends that Windows and Mac OS X users of the browser plug-in update their systems immediately.
Adobe is scheduled to release updates to Acrobat and Reader that address a zero-day flaw in the software that could allow an attacker to take control of a compromised system.
Something similar to the zero-day exploit recently discovered in Adobe's Reader and Acrobat tools has been found for its Flash Player as well.