CVE-2026-21527: Microsoft Exchange Server Spoofing Vulnerability
Microsoft · Microsoft Exchange Server 2016 Cumulative Update 23
Vendor fix available · Affected: Microsoft Exchange Server 2016 Cumulative Update 23 · Exploitation: possible (1 to 10%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 94% of scored CVEs
DescriptionCVE.org
User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
Affected products4
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Microsoft · Microsoft Exchange Server 2016 Cumulative Update 23from 15.01.0.0 before 15.01.2507.066
- Microsoft · Microsoft Exchange Server 2019 Cumulative Update 14from 15.02.0.0 before 15.02.1544.039
- Microsoft · Microsoft Exchange Server 2019 Cumulative Update 15from 15.02.0.0 before 15.02.1748.043
- Microsoft · Microsoft Exchange Server Subscription Edition RTMfrom 15.02.0.0 before 15.02.2562.037
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Possible (1 to 10%). EPSS between 1% and 10%.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Microsoft
- Published
- February 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-21527 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.