Vulnerability Details CVE-2021-26887
<p>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.</p>
<p>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.</p>
<p>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 <strong>FAQ</strong> section of this CVE for configuration guidance.</p>
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 64.5%
CVSS Severity
CVSS v3 Score 7.8
CVSS v2 Score 4.6
References
Products affected by CVE-2021-26887
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cpe:2.3:o:microsoft:windows_10:-
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cpe:2.3:o:microsoft:windows_10:1607
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cpe:2.3:o:microsoft:windows_10:1803
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cpe:2.3:o:microsoft:windows_10:1809
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cpe:2.3:o:microsoft:windows_10:1909
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cpe:2.3:o:microsoft:windows_10:2004
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cpe:2.3:o:microsoft:windows_10:20h2
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cpe:2.3:o:microsoft:windows_7:-
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cpe:2.3:o:microsoft:windows_8.1:-
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cpe:2.3:o:microsoft:windows_rt_8.1:-
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cpe:2.3:o:microsoft:windows_server_2008:-
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cpe:2.3:o:microsoft:windows_server_2008:r2
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cpe:2.3:o:microsoft:windows_server_2012:-
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cpe:2.3:o:microsoft:windows_server_2012:r2
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cpe:2.3:o:microsoft:windows_server_2016:-
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cpe:2.3:o:microsoft:windows_server_2016:1909
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cpe:2.3:o:microsoft:windows_server_2016:2004
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cpe:2.3:o:microsoft:windows_server_2016:20h2
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cpe:2.3:o:microsoft:windows_server_2019:-