Authenticated privilege escalation via absolute path traversal
Published Oct 13, 2026 · Updated Oct 13, 2026
Path traversal in Microsoft Windows Encrypting File System (EFS) allows remote authenticated users to elevate privileges via network requests. Microsoft identifies absolute path traversal but does not disclose the affected function or the incorrect path-handling operation in the retrieved CNA record. Existing authorization is required; the resulting privilege level and any additional service or configuration prerequisites are not disclosed.
Summary
What happened
Path traversal in Microsoft Windows Encrypting File System (EFS) allows remote authenticated users to elevate privileges via network requests. Microsoft identifies absolute path traversal but does not disclose the affected function or the incorrect path-handling operation in the retrieved CNA record. Existing authorization is required; the resulting privilege level and any additional service or configuration prerequisites are not disclosed.
The record
- CVE
- CVE-2026-83784
- Published
- Oct 13, 2026
- Updated
- Oct 13, 2026
- Vendor
- Microsoft Corporation
- Product
- Windows Server 2019
- Classifications
- CWE-36, T1068
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 13, 2026CVE publishedPublication date reported by the CVE source.
- Oct 13, 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 <10.0.17763.9376
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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.
Activity data is delayed. The latest report is Sep 28, 2026.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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