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CVE-2026-55008

Microsoft Exchange Server cross-site scripting (XSS)

9.6 CRITICALEPSS 0.86%
  1. Published14 Jul 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

Microsoft Exchange Server2016 · 2019
Microsoft Exchange Server Subscription Edition< 15.02.2562.045

Remediation

Fixed in
Microsoft Exchange Server Subscription Edition≥ 15.02.2562.045

References

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Frequently asked

Is CVE-2026-55008 being actively exploited?

CVE-2026-55008 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.86%.

How severe is CVE-2026-55008?

CVE-2026-55008 has a CVSS 3.1 base score of 9.6, rated critical. EPSS estimates a 0.86% probability of exploitation.

Which products are affected by CVE-2026-55008?

Affected products include Microsoft Exchange Server, Microsoft Exchange Server Subscription Edition.

How do I fix CVE-2026-55008?

Upgrade affected software to a fixed version, for example Microsoft Exchange Server Subscription Edition 15.02.2562.045 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-55008 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.