Microsoft published earlier today the Patch Tuesday security bulletin for May 2018 , containing Vulnerability-related.PatchVulnerability fixes for 67 security issues . This month , Microsoft fixed Vulnerability-related.PatchVulnerability security flaws in Microsoft Windows , Internet Explorer , Microsoft Edge , ChakraCore , .NET Framework , Microsoft Exchange Server , Windows Host Compute Service Shim , and Microsoft Office and Microsoft Office Services and Web Apps . Microsoft patches Vulnerability-related.PatchVulnerability two zero-days The biggest issue patched Vulnerability-related.PatchVulnerability this month is a zero-day in Internet Explorer that has been abused by a cyber-espionage campaign earlier this month . The zero-day ( CVE-2018-8174 ) affects Vulnerability-related.DiscoverVulnerability not only IE but also any other projects that embed the IE web rendering engine . Microsoft credited researchers from both Qihoo 360 Core Security and Kaspersky Lab for discovering Vulnerability-related.DiscoverVulnerability this issue . The second zero-day is CVE-2018-8120 , an elevation-of-privilege vulnerability in the Win32k component . `` An attacker who successfully exploited Vulnerability-related.DiscoverVulnerability this vulnerability could run arbitrary code in kernel mode . An attacker could then install programs ; view , change , or delete data ; or create new accounts with full user rights , '' Microsoft says . But the flaw is not as dangerous as it sounds , as an attacker already needs a foothold on Windows systems to run his malicious code in the first place , to elevate his access rights . Microsoft also patched Vulnerability-related.PatchVulnerability CVE-2018-8141 ( Windows Kernel Information Disclosure Vulnerability ) and CVE-2018-8170 ( Windows Image Elevation of Privilege Vulnerability ) , for which exploitation details became public . Despite info about these two flaws being published Vulnerability-related.DiscoverVulnerability online , Microsoft says Vulnerability-related.DiscoverVulnerability none were exploited Vulnerability-related.DiscoverVulnerability in the wild . Flash fixes also included Last but not least , the Microsoft May 2018 Patch Tuesday also included a patch for an Adobe Flash Player vulnerability ( CVE-2018-4944 ) that Adobe patched Vulnerability-related.PatchVulnerability earlier today . Below is a table listing of all the security issues Microsoft fixed Vulnerability-related.PatchVulnerability this month . We used PowerShell and the Microsoft API to assemble the table below , but the report is much longer . We hosted the full report on GitHub , here .