November 14, 2026

CVE Watchtower

CVE-2026-96940Microsoft Exchange Server

NVDCVSS scored by secure@microsoft.com

Vulnerability Summary

Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Severity Level
HIGH(8.8)
Published Date
Oct 2, 2026
Last Modified
Oct 15, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
2.75%Probability
Root Weakness (CWE)
CWE-1390 β†—
See the MITRE CWE entry for the full definition of this weakness.
CVSS v3.1 Base Metrics — Score 8.8 (HIGH)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Microsoft Exchange Server
  • Microsoft Exchange Server Subscription Edition < 15.02.2562.053
Patched Versions
  • Microsoft Exchange Server Subscription Edition 15.02.2562.053

What to do

Plan remediation soon. No exploitation is confirmed yet, but the severity is high.

  1. Check whether you run Microsoft Exchange Server and which version.
  2. Update to a patched version listed above, then confirm the new version.

Timeline

  • Oct 2, 2026Published
  • Oct 15, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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Related Coverage

More Microsoft Exchange Server CVEs

All Microsoft vulnerabilities →

External References

Data last checked: Nov 14, 2026 13:06 UTC