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Microsoft Exchange ServerMicrosoft Exchange Server Remote Code Execution Vulnerability

Risk 89
Severity
7.8
Exploited
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

1 / 3
Source: CISA
First published (updated )
CVE-2021-26858

Microsoft Exchange ServerMicrosoft Exchange Server Remote Code Execution Vulnerability

Risk 90
Severity
7.8
Exploited
Path Traversal
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

1 / 3
Source: CISA
First published (updated )
CVE-2021-27065

Microsoft Exchange ServerMicrosoft Exchange Server Remote Code Execution Vulnerability

Risk 89
Severity
7.8
Exploited
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

1 / 3
Source: CISA
First published (updated )
CVE-2021-26857

Microsoft Exchange ServerMicrosoft Exchange Server Remote Code Execution Vulnerability

Risk 99
Severity
9.8
Exploited
SSRF
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

1 / 3
Source: CISA
First published (updated )
CVE-2021-26855

Microsoft Exchange ServerMicrosoft Exchange Server Cross-Site Scripting Vulnerability

Risk 72
Severity
8.1
Exploited
XSS
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C

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.

1 / 3
Source: Microsoft
First published (updated )
CVE-2026-42897

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