CVE-2026-55008

9.6 criticalEPSS 0.9%

Critical (9.6) in microsoft. EPSS 0.9% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.6 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS: 0.9% chance of exploitation in the next 30 days; higher than 58% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-07-14
Modified: 2026-07-24
Record from: the NVD, synced 2026-10-19

Affected

microsoft:exchange_server
microsoft:exchange_server_subscription_edition

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55008

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