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CVE-2026-42897— Microsoft Exchange Server Spoofing Vulnerability

Quick assessment

Affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23
Exploitation
Confirmed exploitation in the wild; remediate immediately
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是美国微软（Microsoft）公司的一套电子邮件服务程序。它提供邮件存取、储存、转发，语音邮件，邮件过滤筛选等功能。 Microsoft Exchange Server存在跨站脚本漏洞，该漏洞源于网页生成过程中输入中和不当，允许未经授权的攻击者通过网络进行欺骗攻击。

CVSS 8.1 · High KEV EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 4

VendorProduct Version RangeStatus
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 15.01.0.0< 15.01.2507.069 affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 15.02.0.0< 15.02.1544.041 affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 15 15.02.0.0< 15.02.1748.046 affected
Microsoft Microsoft Exchange Server Subscription Edition RTM 15.02.0.0< 15.02.2562.043 affected
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I. Basic Information for CVE-2026-42897

Vulnerability Information
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Vulnerability Title
Microsoft Exchange Server Spoofing Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Exchange Server 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Exchange Server是美国微软（Microsoft）公司的一套电子邮件服务程序。它提供邮件存取、储存、转发，语音邮件，邮件过滤筛选等功能。 Microsoft Exchange Server存在跨站脚本漏洞，该漏洞源于网页生成过程中输入中和不当，允许未经授权的攻击者通过网络进行欺骗攻击。
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 2016 Cumulative Update 23 15.01.0.0 ~ 15.01.2507.069 -
Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 15.02.0.0 ~ 15.02.1544.041 -
Microsoft Microsoft Exchange Server 2019 Cumulative Update 15 15.02.0.0 ~ 15.02.1748.046 -
Microsoft Microsoft Exchange Server Subscription Edition RTM 15.02.0.0 ~ 15.02.2562.043 -

II. Public POCs for CVE-2026-42897

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III. Intelligence Information for CVE-2026-42897

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Vendor Advisories for CVE-2026-42897 (1)

Same Patch Batch · Microsoft · 2026-05-14 · 3 CVEs total

CVE-2026-41615 9.6 CRITICAL Microsoft Authenticator Information Disclosure Vulnerability
CVE-2026-44503 Kiota abstractions RedirectHandler leaks Cookie/Proxy-Authorization headers on cross-host

IV. Related Vulnerabilities

Same product: Microsoft Exchange Server 2016 Cumulative Update 23
Same vendor: Microsoft
Same weakness: CWE-79

V. Comments for CVE-2026-42897

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