CVE-2026-42897 :: Enginsight Vulnerability Database

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	8.1 HIGH	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Base Score

CVSS 3.x

EPSS Score

Percentile: 91%

Affected Products (NVD)

Vendor	Product	Version
microsoft	exchange_server	𝑥 < 15.02.2562.043

𝑥

= Vulnerable software versions

Common Weakness Enumeration

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Vulnerability Media Exposure

[GERMAN] (g+) Exchange OWA XSS: Angriff per Mail und ein Patch, der nicht alle erreicht
Ein aktiv ausgenutzter Zero-Day in Exchange OWA ist gepatcht, für 2016 und 2019 aber nur gegen Aufpreis. Was zu tun ist. ( Security , Microsoft )
Published: 2026-06-20T10:00:09+02:00
[ENGLISH] Microsoft Reports Severe Zero-Day Flaw in On-Prem Exchange Servers
The zero-day vulnerability affects on-premises installations for all versions of Exchange Server 2016, 2019 and Subscription Edition
Published: 2026-05-15T12:35:00+00:00

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42897