CVE-2021-26887 (GCVE-0-2021-26887)
Vulnerability from cvelistv5
Published
2021-03-11 15:42
Modified
2026-08-19 16:30
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Elevation of Privilege
Summary
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.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
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Impacted products
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See the FAQ section of this CVE for configuration guidance.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en-US\", \"type\": \"Impact\", \"description\": \"Elevation of Privilege\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_10_20H2:*:*:*:*:*:*:x86:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_20H2:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:arm64:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:x86:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_1909:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x86:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_7:*:sp1:*:*:*:*:x86:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_7:*:sp1:*:*:*:*:x64:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_8.1:*:*:*:*:*:*:x86:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2008_sp2:*:*:*:*:*:*:x64:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2008_sp2:*:*:*:*:*:*:x64:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2008_R2:*:*:*:*:*:*:x64:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2008_R2:*:*:*:*:*:*:x64:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2.9200.23298\", \"versionStartIncluding\": \"6.2.9200.0\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2.9200.23298\", \"versionStartIncluding\": \"6.2.9200.0\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}, {\"criteria\": \"cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*\", \"vulnerable\": true, \"versionStartIncluding\": \"-\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"shortName\": \"microsoft\", \"dateUpdated\": \"2026-08-19T16:30:31.969Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2021-26887\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-19T16:30:31.969Z\", \"dateReserved\": \"2021-02-08T00:00:00.000Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2021-03-11T15:42:16.000Z\", \"assignerShortName\": \"microsoft\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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