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CVE-2026-96940

Microsoft Exchange Server Elevation of Privilege Vulnerability

8.8 HighPublic exploit

CVE-2026-96940 is a high vulnerability (CVSS 8.8) in Microsoft Exchange Server, published October 2, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 2.75%, the 86th percentile. No source names a fixed version.

What does this mean?
Severity
8.8 HighCVSS 3.1, CVE List
Exploit chance
2.75%EPSS, 86th percentile
Exploitation
None known1 public exploit
Fixed in
No fix listedNo source names one

Description

Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

2.75%Up 2.3 points since Oct 3, 2026
90%50%10%1%

Discussion

Quiet in the last day.
14 days ago: 0 people13 days ago: 0 people12 days ago: 0 people11 days ago: 1 person10 days ago: 1 person9 days ago: 1 person8 days ago: 0 people7 days ago: 0 people6 days ago: 0 people5 days ago: 0 people4 days ago: 0 people3 days ago: 0 people2 days ago: 0 people1 day ago: 0 peopleLast 24 hours: 0 people

Affected products

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubHORKimhab/CVE-2026-969402026-10-06

What each source reports

CVE List Score used8.8

Microsoft Exchange Server Elevation of Privilege Vulnerability

Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Record
CVE-2026-96940
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Weakness
CWE-1390
Updated
2026-11-10
EUVDEUVD-2026-917718.8

Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Record
EUVD-2026-91771
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Updated
2026-11-10
GitHub AdvisoriesGHSA-q9jh-jffv-9xvh8.8

Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate...

Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network.

Record
GHSA-q9jh-jffv-9xvh
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-1390
Updated
2026-11-02
NVD8.8

Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Record
CVE-2026-96940
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-1390
Updated
2026-11-02

History

History
RecordedChangedSources
factsCVE List, EUVD
first indexedCVE List, EUVD, GitHub Advisories, NVD, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

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