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Medium severity6.5NVD Advisory· Published Feb 10, 2026· Updated Jun 17, 2026

CVE-2026-21527

CVE-2026-21527

Description

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

Affected products

9
  • Microsoft/Exchange Server5 versions
    cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_23:*:*:*:*:*:*+ 4 more
    • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_23:*:*:*:*:*:*
    • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_14:*:*:*:*:*:*
    • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_15:*:*:*:*:*:*
    • (no CPE)
    • (no CPE)range: 15.02.0.0
  • Microsoft/Exchange Server Subscription Edition
    cpe:2.3:a:microsoft:exchange_server_subscription_edition:*:*:*:*:*:*:*:*
    Range: <15.02.2562.037
  • Microsoft/Microsoft Exchange Server 2016 Cumulative Update 23v5
    Range: 15.01.0.0
  • Microsoft/Microsoft Exchange Server 2019 Cumulative Update 14v5
    Range: 15.02.0.0
  • Microsoft/Microsoft Exchange Server 2019 Cumulative Update 15v5
    Range: 15.02.0.0

Patches

Vulnerability mechanics

References

1

News mentions

1