Microsoft Exchange Server Remote Code Execution Vulnerability
Published Jul 14, 2026
8.8
HIGHCVSS 3.1
EPSS 1.01%
Description
Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
Affected products
-
- Version 15.01.0.0StatusaffectedConstraints<15.01.2507.071
- Version
-
- Version 15.02.0.0StatusaffectedConstraints<15.02.1544.043
- Version
-
- Version 15.02.0.0StatusaffectedConstraints<15.02.1748.048
- Version
-
- Version 15.02.0.0StatusaffectedConstraints<15.02.2562.045
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 23 | n/a |
| ||||||
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 14 | n/a |
| ||||||
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 15 | n/a |
| ||||||
| Microsoft | Microsoft Exchange Server Subscription Edition RTM | n/a |
|
- 2016
- 2019
- 2019
- < 15.02.2562.045
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
1 other source (NVD) ▾
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Jul 15, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Jul–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 1.01% (0.01010) | 61.89th | v5 (v2026.06.15) |
| Jul 15, 2026 | 0.66% (0.00663) | 47.54th | v5 (v2026.06.15) |
References (1)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55005 vendor-advisorypatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55005 | vendor-advisorypatchVendor Advisory |
Change history (0)
No recorded changes yet.