CVE-2026-21527

6.5 mediumEPSS 8.3%

Medium (6.5) in microsoft. EPSS 8.3% chance of exploitation in the next 30 days.

User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

Severity

CVSS 3.1

6.5 medium

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

EPSS: 8.3% chance of exploitation in the next 30 days; higher than 94% of CVEs (scores of 2026-10-31)
CWEs: CWE-345, CWE-451, CWE-1286
Published: 2026-02-10
Modified: 2026-06-17
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-2026-21527

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