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CVE-2026-55007

Microsoft Exchange Server Remote Code Execution Vulnerability

HIGH
8.1
CVSS Score
Published: September 8, 2026 at 05:10 PM UTC
Updated: October 14, 2026 at 11:05 PM UTC
2 products affected across 1 vendorExchange ServerExchange Server Subscription Edition

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Severity
HIGH8.1
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.

Affected

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

Exchange Server· Microsoft
95%
15.02.0.0 ≤ v < 15.02.1544.04615.02.0.0 ≤ v < 15.02.1748.05115.02.0.02019 cumulative_update_142019 cumulative_update_15
Affected range stops below 15.02.1544.046, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.02.1748.051, so it looks safe — our inference, not a vendor statement
Exchange Server Subscription Edition· Microsoft
95%
v < 15.02.2562.04915.02.0.0 ≤ v < 15.02.2562.04915.02.0.0
Affected range stops below 15.02.2562.049, so it looks safe — our inference, not a vendor statement

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-2026-55007

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

8.1HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-415

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