CVE-2021-26887
HighCVSS 7.8Exploitation Probability (EPSS)
Elevated risk58th percentile - higher than 58% of all known CVEs
Summary
Elevation of privilege vulnerability in Microsoft Windows when Folder redirection is enabled via Group Policy. An attacker could redirect another user's personal data to a created folder.
Risk Assessment
An attacker could gain access to other users' personal data.
Recommendation
Reconfigure Folder Redirection with Offline files and restrict permissions. No security update is available.
Other vulnerabilities in Microsoft Windows
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In Microsoft Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016, there is a vulnerability that allows elevation of privilege due to the way it handles objects in memory.
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Windows Event Tracing Elevation of Privilege Vulnerability
Original NVD description (English source)
An elevation of privilege vulnerability exists in Microsoft Windows when Folder redirection has been enabled via Group Policy. When folder redirection file server is co-located with Terminal server, an attacker who successfully exploited the vulnerability would be able to begin redirecting another user's personal data to a created folder. To exploit the vulnerability, an attacker can create a new folder under the Folder Redirection root path and create a junction on a newly created User folder. When the new user logs in, Folder Redirection would start redirecting to the folder and copying personal data. This elevation of privilege vulnerability can only be addressed by reconfiguring Folder Redirection with Offline files and restricting permissions, and NOT via a security update for affected Windows Servers. See the FAQ section of this CVE for configuration guidance.