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CVE-2026-69375— Microsoft Exchange Server Tampering Vulnerability

Quick assessment

Affected

Microsoft Microsoft Exchange Server 2016 Cumulative Update 23

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存在授权问题漏洞，该漏洞源于通过用户控制的密钥绕过授权，可能导致已授权攻击者通过网络执行篡改。

CVSS 6.5 · Medium EPSS 0.64% · P51 Updated Nov 01, 2026

Possible ATT&CK Techniques 2 AI

T1557 · Adversary-in-the-Middle T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

Vendor	Product	Version Range	Status
Microsoft	Microsoft Exchange Server 2016 Cumulative Update 23	`15.01.0.0< 15.01.2507.073`	affected
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-2026-69375

Vulnerability Information

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Vulnerability Title

Microsoft Exchange Server Tampering Vulnerability

Source: CVE Program / CVE List V5

Vulnerability Description

Authorization bypass through user-controlled key in Microsoft Exchange Server allows an authorized attacker to perform tampering over a network.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

通过用户控制密钥绕过授权机制

Source: CVE Program / CVE List V5

Vulnerability Title

Microsoft Exchange Server 授权问题漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

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
Microsoft	Microsoft Exchange Server 2016 Cumulative Update 23	15.01.0.0 ~ 15.01.2507.073	-
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-2026-69375

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-69375

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Vendor Advisories for CVE-2026-69375 (1)

🔗 CVE-2026-69375 - Security Update Guide - Microsoft - Microsoft Exchange Server Tampering Vulnerability vendor-advisory patch

https://www.cve.org/CVERecord?id=CVE-2026-69375

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

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

IV. Related Vulnerabilities

Same product: Microsoft Exchange Server 2016 Cumulative Update 23

Same vendor: Microsoft

Same weakness: CWE-639