CVE-2026-21527HighCVSS 6.5
Microsoft Exchange Server Spoofing Vulnerability
🔗 CVE IDs covered (1)
📋 Description
User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
🎯 Affected products4
- Microsoft Exchange Server 2016 Cumulative Update 23
- Microsoft Exchange Server 2019 Cumulative Update 14
- Microsoft Exchange Server 2019 Cumulative Update 15
- Microsoft Exchange Server Subscription Edition RTM
✅ Remediation
KB5074992 (Security Update) — fixed build 15.02.2562.037 KB5074995 (Security Update) — fixed build 15.01.2507.066 KB5074993 (Security Update) — fixed build 15.02.1748.043 KB5074994 (Security Update) — fixed build 15.02.1544.039
🔗 References (6)
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21527
- patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108556
- referencehttps://support.microsoft.com/help/5074992
- referencehttps://support.microsoft.com/help/5074995
- referencehttps://support.microsoft.com/help/5074993
- referencehttps://support.microsoft.com/help/5074994