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Recorded 23 Oct 2026 at 08:31 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.

The historical field “Public exploit code” recorded Nuclei detection-template membership. It did not establish exploit availability. The original recorded fields remain below.

The historical “Publicly disclosed: No” field could represent a missing MSRC assessment. It does not establish that the vulnerability was undisclosed. The original recorded fields remain below.

CVEMicrosoft Security Response Center

Windows Installer Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges locally.

What it said

CVE
CVE-2026-71339
Severity
Unrated
CVSS base score
Not published
CVSS vector
Not published
Impact
Not stated
Exploitation detected
Not reported by MSRC
Publicly disclosed
No
Exploitability
Exploitation Less Likely
Component
Windows Installer
Weakness
CWE-122: Heap-based Buffer Overflow
Issued by
Microsoft
Customer action
Required: apply the update
Affected products
Updates that fix it
No KB listed
CISA KEV
Unknown: catalog evidence is incomplete or retained
EPSS
0.3%; scored 22 Oct 2026
Public exploit code
Unknown: exploit-code evidence is incomplete or retained
Published
8 Sep 2026 07:00 UTC
Last revised
16 Oct 2026 07:00 UTC
Revision note
Updated an acknowledgement. This is an informational change only.

Source evidence when recorded

Microsoft security releases
IncompleteRead 23 Oct 2026 at 08:14 UTC
CISA KEV
IncompleteRead 23 Oct 2026 at 08:14 UTC
FIRST EPSS
IncompleteRead 23 Oct 2026 at 08:14 UTC
Public detection templates (Nuclei)
IncompleteRead 23 Oct 2026 at 08:14 UTC

Coverage describes the sources at this observation. A complete read then does not establish their current position.

What changed

  1. Detection template: No Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained · CISA KEV: Not listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  2. Publisher revision note: Information published. → Updated an acknowledgement. This is an informational change only. · Fixes: KB5122871: Windows Server 2025, Windows Server 2025 (Server Core installation) (restart required); KB5122876: Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation) (restart required); KB5122878: Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems (restart required); KB5122880: Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems (restart required); KB5122882: Windows Server 2022, Windows Server 2022 (Server Core installation) (restart required); KB5123065: Windows Server 2012, Windows Server 2012 (Server Core installation) (restart required); KB5123066: Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) (restart required); KB5123099: Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2016, Windows Server 2016 (Server Core installation) (restart required); KB5124008: Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems (restart required); KB5124012: Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems (restart required) → No KB listed · Affected products: Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022 (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation) → · Impact: Elevation of Privilege → Not stated · CVSS vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C → Not published · CVSS score: 6.7 → Not published · Severity: Important → Unrated
Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (24)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  2. 23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  3. 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  4. 23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
  5. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
  6. 23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  7. 22 Oct 2026 · 17:33:15 UTC EPSS0.3%; scored 21 Oct 2026 → 0.3%; scored 22 Oct 2026
  8. 21 Oct 2026 · 21:47:24 UTC EPSS0.3%; scored 20 Oct 2026 → 0.3%; scored 21 Oct 2026
  9. 20 Oct 2026 · 20:53:31 UTC EPSS0.3%; scored 19 Oct 2026 → 0.3%; scored 20 Oct 2026
  10. 19 Oct 2026 · 15:12:40 UTC EPSS0.3%; scored 18 Oct 2026 → 0.3%; scored 19 Oct 2026
  11. 18 Oct 2026 · 14:54:30 UTC EPSS0.3%; scored 16 Oct 2026 → 0.3%; scored 18 Oct 2026
  12. 18 Oct 2026 · 14:54:30 UTC Link: September 2026/security?release=2026-Sep#cves
  13. 16 Oct 2026 · 16:13:25 UTC EPSS0.3%; scored 15 Oct 2026 → 0.3%; scored 16 Oct 2026
  14. 16 Oct 2026 · 15:49:54 UTC Revision noteInformation published. → Updated an acknowledgement. This is an informational change only.
  15. 16 Oct 2026 · 15:49:54 UTC Last revised8 Sep 2026 07:00 UTC → 16 Oct 2026 07:00 UTC
  16. 16 Oct 2026 · 15:49:54 UTC Updates that fix itKB5122871: Windows Server 2025, Windows Server 2025 (Server Core installation) (restart required); KB5122876: Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation) (restart required); KB5122878: Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems (restart required); KB5122880: Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems (restart required); KB5122882: Windows Server 2022, Windows Server 2022 (Server Core installation) (restart required); KB5123065: Windows Server 2012, Windows Server 2012 (Server Core installation) (restart required); KB5123066: Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) (restart required); KB5123099: Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2016, Windows Server 2016 (Server Core installation) (restart required); KB5124008: Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems (restart required); KB5124012: Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems (restart required) → No KB listed
  17. 16 Oct 2026 · 15:49:54 UTC Affected productsWindows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022 (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation) →
  18. 16 Oct 2026 · 15:49:54 UTC ImpactElevation of Privilege → Not stated
  19. 16 Oct 2026 · 15:49:54 UTC CVSS vectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C → Not published
  20. 16 Oct 2026 · 15:49:54 UTC CVSS base score6.7 → Not published
  21. 16 Oct 2026 · 15:49:54 UTC SeverityImportant → Unrated
  22. 15 Oct 2026 · 21:30:54 UTC EPSS0.3%; scored 14 Oct 2026 → 0.3%; scored 15 Oct 2026
  23. 15 Oct 2026 · 01:07:54 UTC EPSS0.3%; scored 13 Oct 2026 → 0.3%; scored 14 Oct 2026
  24. 14 Oct 2026 · 11:22:42 UTC Source coverage: msrc-cvrfIncomplete → Current
ChangeIntel

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Sources read 9 Nov 23:26 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current

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