Recently Microsoft Security Bulletin MS14-050 has been released as Critical. It applies to following products:
Maximum Security Impact: Elevation of Privilege
Aggregate Severity Rating: Important
This security update may require reboot.
Microsoft Security Bulletin MS14-050 – August 2014
MS Knowledge Base Articles
MS14-050: Vulnerability in Microsoft SharePoint Server could allow elevation of privilege: August 12, 2014
MS14-050: Description of the security update for SharePoint Services: August 12, 2014
Common Vulnerabilities and Exposures
Updates Replaces by this update – MS14-022
Download MS14-050 – Security Update for Microsoft SharePoint Enterprise Server 2013 (KB2880994)
No mitigating factors have been identified.
For SharePoint instances, evaluate and remove apps as appropriate. Install new apps from trusted sources only.