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CVE record · CVE-2026-45504

Microsoft Exchange Server Elevation of Privilege Vulnerability

CVSS 8.8 HighEPSS 0.012 · 67th percentile

Published by the CVE Program (CNA: microsoft) at 9 Jun 2026, 17:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23
  • affected 15.01.0.0 to before 15.01.2507.071 custom
Microsoft Microsoft Exchange Server 2019 Cumulative Update 14
  • affected 15.02.0.0 to before 15.02.1544.043 custom
Microsoft Microsoft Exchange Server 2019 Cumulative Update 15
  • affected 15.02.0.0 to before 15.02.1748.048 custom
Microsoft Microsoft Exchange Server Subscription Edition RTM
  • affected 15.02.0.0 to before 15.02.2562.045 custom
Identifiers
CVE-2026-45504
CNA
microsoft
Weakness (CWE)
CWE-918
Tags
Published
9 Jun 2026
Updated
24 Sept 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.8 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.012, the 67th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 9 Jun 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.