Local privilege escalation
Published Mar 11, 2021 · Updated Aug 19, 2026
Elevation of privilege in the Windows App-V Overlay Filter allows local users with low privileges to gain elevated Windows privileges. Microsoft has not published the vulnerable function, the input reaching it, or the incorrect operation performed by the overlay filter. Successful exploitation requires local access and existing low privileges and grants control over data and service operation within the same security authority.
Summary
What happened
Elevation of privilege in the Windows App-V Overlay Filter allows local users with low privileges to gain elevated Windows privileges. Microsoft has not published the vulnerable function, the input reaching it, or the incorrect operation performed by the overlay filter. Successful exploitation requires local access and existing low privileges and grants control over data and service operation within the same security authority.
The record
- CVE
- CVE-2021-26860
- Published
- Mar 11, 2021
- Updated
- Aug 19, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 11, 2021CVE publishedPublication date reported by the CVE source.
- Aug 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.1817
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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