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CVE-2026-87696

Microsoft Exchange Server Elevation of Privilege Vulnerability

HIGH
7.5
CVSS Score
Published: October 13, 2026 at 07:01 PM UTC
Updated: October 25, 2026 at 06:47 PM UTC
2 products affected across 1 vendorExchange ServerExchange Server Subscription Edition

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87696

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHmicrosoft
Vector?

Quick Info

StatusUNDERGOING ANALYSIS
CWE
CWE-347

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