Microsoft's decision to hold back an Excel patch from last month's Patch Tuesday may have left millions exposed as attackers target the un-patched flaw in Excel.

The US Computer Emergency Readiness Team (US-CERT) has issued a warning that Excel file attachments are being used to spread a trojan which allows a hacker to gain user rights to a PC.

The trojan is packed inside an Excel attachment and exploits a flaw discovered in multiple versions of Excel in January.

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Microsoft, Excel, Microsoft office, Exploit, Vulnerability, Trojan