CVE-2021-26887
Plain English Summary
AI-powered analysis for quick understanding
This vulnerability allows an attacker to redirect another user's personal data to a folder they control, effectively stealing sensitive information. It requires that folder redirection is enabled through Group Policy and that the attacker has access to the same file server as the targeted user.
Technical Description
<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>
CVSS Vector Analysis
Vector String
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploit Resources
Search for proof-of-concept code and exploit modules
Official References
Quick Information
Published
Mar 11, 2021
about 5 years ago
Last Modified
Feb 24, 2026
about 1 month ago
Vendor
microsoft
Product
windows 10
Related Vulnerabilities
This vulnerability allows an attacker to gain elevated privileges on Azure HDInsight by exploiting the Apache Oozie Workflow Scheduler, potentially letting them access sensitive data or execute unauthorized actions. To take advantage of this flaw, the attacker must have the ability to submit malicious XML data to the system.
This vulnerability allows an attacker to gain elevated privileges within Azure HDInsight by exploiting a flaw in the Apache Ambari JDBC interface. To take advantage of this, the attacker must have access to the Ambari server, which typically requires some level of authentication or network access.
This vulnerability allows an attacker to impersonate a legitimate user in Azure HDInsight, potentially gaining unauthorized access to sensitive data or resources. To exploit this flaw, the attacker must be able to send specially crafted requests to the system, which requires some level of access to the network where HDInsight is deployed.
This vulnerability allows an attacker to impersonate a legitimate user in Azure HDInsight, potentially gaining unauthorized access to sensitive data and resources. To exploit this, the attacker must already have access to the network where the Azure service is running.
This vulnerability allows an attacker to impersonate a legitimate user in Azure HDInsight's Apache Oozie service, potentially leading to unauthorized access to sensitive data or operations. To exploit this, the attacker must have network access to the affected service and be able to send specially crafted requests.