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CVE-2026-77910

8.8 high SSVC exploitation: none Published
NVD · CVE.org

Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Fix

Microsoft's update · Important

  • KB5128895 — Microsoft Exchange Server Subscription Edition RTM · build 15.02.2562.056
  • KB5128896 — Microsoft Exchange Server 2019 Cumulative Update 15 · build 15.02.1748.055
  • KB5128897 — Microsoft Exchange Server 2019 Cumulative Update 14 · build 15.02.1544.050
  • KB5128898 — Microsoft Exchange Server 2016 Cumulative Update 23 · build 15.01.2507.077

From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-28 · Exploitation Less Likely.

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 2

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-19 19:39
  2. First seenCVSS 8.8NVD modified 2026-10-14 04:18

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 1