Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-62911

CVE-2026-62911HIGH

Microsoft Exchange Server Elevation of Privilege Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   R  U  H  H  H    8.0   .0069   51.3     —

AFFECTED
  Product                                              Versions     Fixed
  Microsoft Exchange Server 2016 Cumulative Update 23  15.01.0.0 –  —
  Microsoft Exchange Server 2019 Cumulative Update 14  15.02.0.0 –  —
  Microsoft Exchange Server 2019 Cumulative Update 15  15.02.0.0 –  —
  Microsoft Exchange Server Subscription Edition RTM   15.02.0.0 –  —

TIMELINE
  Jul 14  Reserved by microsoft
  Aug 11  Published (CNA: microsoft)
  Sep 1   EXPLOIT PUBLISHED — CVE-2026-62911 (Microsoft Exchange Server 2016 Cumulative Update 23). Public exploit reference added.
  Sep 3   EXPLOIT PUBLISHED — CVE-2026-62911 (Microsoft Exchange Server 2016 Cumulative Update 23). Public exploit reference added.

CWE-294 · CNA: microsoft · CVSS v3.1 · 2 references · NVD status: Modified

Description

Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
July 14, 2026	Reserved	Reserved by microsoft
August 11, 2026	Published	Published (CNA: microsoft)
September 1, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-62911 (Microsoft Exchange Server 2016 Cumulative Update 23). Public exploit reference added.
September 3, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-62911 (Microsoft Exchange Server 2016 Cumulative Update 23). Public exploit reference added.

Affected

Affected products and packages — 4 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Microsoft Exchange Server 2016 Cumulative Update 23	—	15.01.0.0	—
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 14	—	15.02.0.0	—
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 15	—	15.02.0.0	—
Microsoft	Microsoft Exchange Server Subscription Edition RTM	—	15.02.0.0	—

Weaknesses

CWE-294

References (2)

https://github.com/hypnguyen1209/CVE-2026-62911 [exploit]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62911 [vendor-advisory, patch]

Authoritative record: CVE-2026-62911 at cve.org

Vendors: microsoft

Weaknesses: CWE-294

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-62911 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.