CVE-2026-87692 Microsoft Exchange Server - Privilege Escalation

Microsoft Exchange Server contains an insecure deserialization vulnerability caused by deserialization of untrusted data, letting authorized attackers elevate privileges locally, exploit requires attacker authorization.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
1.59% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Privilege Escalation
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
13 October 2026
Updated
15 October 2026
Weakness
CWE-502

Vendor fix

Update to the latest version of Microsoft Exchange Server.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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