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CVE-2026-55005

Microsoft Exchange Server Remote Code Execution Vulnerability

HIGH
8.8
CVSS Score
Published: July 14, 2026 at 05:04 PM UTC
Updated: October 14, 2026 at 10:10 PM UTC
2 products affected across 1 vendorExchange ServerExchange Server Subscription Edition

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Severity
HIGH8.8
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

Heap-based buffer overflow in Microsoft Exchange Server allows an authorized 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%
15.01.0.015.02.0.020162016 cumulative_update_2320192019 cumulative_update_142019 cumulative_update_15
Affected range stops below 15.01.2507.071, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.02.1544.043, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.02.1748.048, so it looks safe — our inference, not a vendor statement
Exchange Server Subscription Edition· Microsoft
95%
All versionsv < 15.02.2562.04515.02.0.0
Affected range stops below 15.02.2562.045, 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-2026-55005

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

8.8HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-122

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