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3624 articles · 153676 vulns · 36/41 feeds (7d)
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8.1
CVE-2026-42897KEVEXPLOITEDPATCHED
microsoft · exchange

Microsoft Exchange Server Spoofing 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.

Affected Products

VendorProductVersions
microsoftexchange-, -, -, -

Also Affects

Downstream vendors/products affected by this vulnerability

VendorProductSourceConfidence
microsoftmicrosoft exchange server 2019 cumulative updatemitre_affected90%
microsoftmicrosoft exchange server subscription edition rtmmitre_affected90%
microsoftexchangecert_advisory90%

References

  • https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897(vendor-advisory, patch)

Related News (6 articles)

Tier B
BSI Advisories2h ago
[NEU] [hoch] Microsoft Exchange Server: Schwachstelle ermöglicht Cross-Site-Scripting- und Spoofing-Angriffe
→ No new info (linked only)
Tier D
Help Net Security2h ago
Unpatched Microsoft Exchange Server vulnerability exploited (CVE-2026-42897)
→ No new info (linked only)
Tier D
BleepingComputer2h ago
Microsoft warns of Exchange zero-day flaw exploited in attacks
→ No new info (linked only)
Tier D
The Hacker News5h ago
On-Prem Microsoft Exchange Server CVE-2026-42897 Exploited via Crafted Email
→ No new info (linked only)
Tier C
VulDB18h ago
CVE-2026-42897 | Microsoft Exchange Server cross site scripting
→ No new info (linked only)
Tier A
Microsoft MSRC22h ago
CVE-2026-42897 Microsoft Exchange Server Spoofing Vulnerability
→ No new info (linked only)
CVSS 3.18.1 HIGH
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C
CISA KEV✅ Yes
Actively exploited✅ Yes
Patch available
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897
CWECWE-79
PublishedMay 14, 2026
Last enriched1h agov3
Tags
zero-daycyberespionageweb shellmicrosoft exchangeEEMS
Trending Score130🔥
Source articles6
Independent6
Info Completeness12/14
Missing: epss, iocs

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Verification

State: verified
Confidence: 0%

Vulnerability Timeline

CVE Published
May 14, 2026
Added to CISA KEV
May 14, 2026
Discovered by ZDM
May 14, 2026
Updated: affectedVersions, tags
May 15, 2026
Updated: severity, affectedVersions
May 15, 2026
Actively Exploited
May 15, 2026
Exploit Available
May 15, 2026
Patch Available
May 15, 2026

Version History

v3
Last enriched 1h ago
v3Tier D1h ago

Updated severity to CRITICAL, added affected version Subscription Edition RTM, and noted that a permanent fix is still in the works.

severityaffectedVersions
via Help Net Security
v2Tier D2h ago

Updated affected versions to include Exchange Server 2016, 2019, and Subscription Edition, and added patch information along with a new tag for EEMS.

affectedVersionstags
via BleepingComputer
v119h ago

Initial creation