Authenticated network privilege escalation
Published Oct 2, 2026 · Updated Oct 2, 2026
Authorization weakness in Microsoft Exchange Server 2016, 2019, and Subscription Edition allows remote authenticated users to elevate privileges. The available advisory record does not identify the Exchange component or the authorization decision that fails. Exploitation requires an authenticated network session; the starting role, gained privilege, and resulting access are undisclosed.
Summary
What happened
Authorization weakness in Microsoft Exchange Server 2016, 2019, and Subscription Edition allows remote authenticated users to elevate privileges. The available advisory record does not identify the Exchange component or the authorization decision that fails. Exploitation requires an authenticated network session; the starting role, gained privilege, and resulting access are undisclosed.
The record
- CVE
- CVE-2026-96940
- Published
- Oct 2, 2026
- Updated
- Oct 2, 2026
- Vendor
- Microsoft Corporation
- Product
- Microsoft Exchange Server 2019 Cumulative Update 14
- Classifications
- Unavailable
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 2, 2026CVE publishedPublication date reported by the CVE source.
- Oct 2, 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=15.02.0.0 <15.02.1544.048
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.
Weakness, pattern, technique
No sourced classifications are available.
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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