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CVE-2026-55007— Microsoft Exchange Server Remote Code Execution Vulnerability

Quick assessment

Affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 14
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Exchange Server是美国Microsoft公司的一款支持邮件收发、日程安排与团队协作的企业电子邮件系统。 Microsoft Exchange Server存在资源管理错误漏洞，该漏洞源于双重释放，可能导致未经授权的攻击者通过网络执行代码。

CVSS 8.1 · High EPSS 0.73% · P52

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 15.02.0.0< 15.02.1544.046 affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 15 15.02.0.0< 15.02.1748.051 affected
Microsoft Microsoft Exchange Server Subscription Edition RTM 15.02.0.0< 15.02.2562.049 affected
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I. Basic Information for CVE-2026-55007

Vulnerability Information
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Vulnerability Title
Microsoft Exchange Server Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
双重释放
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Exchange Server 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Exchange Server是美国Microsoft公司的一款支持邮件收发、日程安排与团队协作的企业电子邮件系统。 Microsoft Exchange Server存在资源管理错误漏洞，该漏洞源于双重释放，可能导致未经授权的攻击者通过网络执行代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 15.02.0.0 ~ 15.02.1544.046 -
Microsoft Microsoft Exchange Server 2019 Cumulative Update 15 15.02.0.0 ~ 15.02.1748.051 -
Microsoft Microsoft Exchange Server Subscription Edition RTM 15.02.0.0 ~ 15.02.2562.049 -

II. Public POCs for CVE-2026-55007

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III. Intelligence Information for CVE-2026-55007

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Vendor Advisories for CVE-2026-55007 (1)

Same Patch Batch · Microsoft · 2026-09-08 · 966 CVEs total

CVE-2026-83941 9.9 CRITICAL Entra ID Elevation of Privilege Vulnerability
CVE-2026-70296 9.8 CRITICAL Windows Imaging Component Remote Code Execution Vulnerability
CVE-2026-69408 9.8 CRITICAL Microsoft Windows Media Foundation Remote Code Execution Vulnerability
CVE-2026-69493 9.8 CRITICAL Windows Event Logging Service Remote Code Execution Vulnerability
CVE-2026-69431 9.8 CRITICAL Telnet Client Remote Code Execution Vulnerability
CVE-2026-69910 9.8 CRITICAL Windows Hyper-V Remote Code Execution Vulnerability
CVE-2026-69491 9.8 CRITICAL Microsoft DirectMusic Remote Code Execution Vulnerability
CVE-2026-67643 9.8 CRITICAL Microsoft SQL Server Remote Code Execution Vulnerability
CVE-2026-78509 9.8 CRITICAL Microsoft Office Outlook Remote Code Execution Vulnerability
CVE-2026-78510 9.8 CRITICAL Microsoft Word Remote Code Execution Vulnerability
CVE-2026-69463 9.8 CRITICAL Windows NTFS Remote Code Execution Vulnerability
CVE-2026-69496 9.8 CRITICAL Windows Compressed Folder Remote Code Execution Vulnerability
CVE-2026-69525 9.8 CRITICAL Remote Desktop Services Remote Code Execution Vulnerability
CVE-2026-69590 9.8 CRITICAL Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
CVE-2026-69715 9.8 CRITICAL Windows Direct Show Remote Code Execution Vulnerability
CVE-2026-69595 9.8 CRITICAL Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
CVE-2026-69730 9.8 CRITICAL Windows DNS Server Remote Code Execution Vulnerability
CVE-2026-73009 9.8 CRITICAL Windows Secure Socket Tunneling Protocol (SSTP) Remote Code Execution Vulnerability
CVE-2026-73010 9.8 CRITICAL Microsoft Failover Cluster Remote Code Execution Vulnerability
CVE-2026-72979 9.8 CRITICAL Windows DHCP Server Remote Code Execution Vulnerability

Showing top 20 of 966 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Microsoft Exchange Server 2019 Cumulative Update 14
Same vendor: Microsoft
Same weakness: CWE-415

V. Comments for CVE-2026-55007

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