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8.1
CVSS
High

CVE-2026-42897

PUBLISHED

Microsoft Exchange Server Spoofing Vulnerability

1 day faster than CISA KEV

Exploited in the wild Remote Low complexity
Vendor
Microsoft
Product
Microsoft Exchange Server 2016 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 14, Microsoft Exchange Server 2019 Cumulative Update 15, Microsoft Exchange Server Subscription Edition RTM
Published
May 14, 2026
EPSS
7.9% · 92% pctl

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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.

cisa microsoft

Weaknesses (CWE)

  • CWE-79

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS scores

CVSS v3.1 8.1 High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C

Exploitation status

Exploited in the wild

Recorded 2026-06-01 13:29:03 UTC · CVE

References

Known exploited vulnerability sources

Catalogues that list this CVE as a known exploited vulnerability.

Source Added
CVE First 2026-06-01 13:29 UTC
CISA 2026-06-02 14:00 UTC

Timeline

  • CVE ID Reserved

  • CVE Published to Public

  • Added to KEVIntel

  • KEV confirmed by CISA