Vulnerability Intelligence Report
Microsoft Exchange Server Elevation of Privilege Vulnerability
CVE-2026-77910
Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
No Active Exploit Signals
CVSS Base Score
8.8
HIGH
Exploitability:2.9
Impact Score:5.9
EPSS Probability:0.77%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-863 ↗CWE-863: Incorrect Authorization
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 23 | 15.01.0.0 < 15.01.2507.077 (affected) |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 14 | 15.02.0.0 < 15.02.1544.050 (affected) |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 15 | 15.02.0.0 < 15.02.1748.055 (affected) |
| Microsoft | Microsoft Exchange Server Subscription Edition RTM | 15.02.0.0 < 15.02.2562.056 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.765%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Microsoft Corporation · Vendor · USA |
| Reserved | 2026-08-21T17:26:55 |
| Published | 2026-10-13T19:01:10 |
| Patch Date | 2026-10-13 |
| Last Updated | 2026-10-14T17:58:01 |
Community Chatter & Buzz