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CRITICAL · 9.6

CVE-2026-55008

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.

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.

CVSS Score

9.6

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
MicrosoftExchange Server2016
MicrosoftExchange Server Subscription Edition< 15.02.2562.045

Related Weaknesses (CWE)

CWE-79

References

FAQ

What is CVE-2026-55008?

CVE-2026-55008 is a vulnerability with a CVSS score of 9.6 (CRITICAL). 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.

How severe is CVE-2026-55008?

CVE-2026-55008 has been rated CRITICAL with a CVSS base score of 9.6/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-55008?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Exchange Server, Microsoft Exchange Server Subscription Edition.