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Recorded 22 Oct 2026 at 17:33 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

Microsoft Excel Remote Code Execution Vulnerability

Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

What it said

CVE
CVE-2026-81396
Severity
Important
CVSS base score
7.8
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact
Remote Code Execution
Exploitation detected
Not reported by MSRC
Publicly disclosed
No
Exploitability
Exploitation Unlikely
Component
Microsoft Office Excel
Weakness
CWE-121: Stack-based Buffer Overflow
Issued by
Microsoft
Customer action
Required: apply the update
Affected products
Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems, Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition), Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition), Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft Office 365 for Mac, Microsoft Office LTSC 2021 for 32-bit editions, Microsoft Office LTSC 2021 for 64-bit editions, Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office LTSC 2024 for 64-bit editions, Microsoft Office LTSC for Mac 2021, Microsoft Office LTSC for Mac 2024, Office Online Server
Updates that fix it
KB5002904: Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition); KB5002910: Office Online Server; KB5002914: Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition)
CISA KEV
Not listed in the collected catalog
EPSS
0.5%; scored 22 Oct 2026
Public exploit code
No Nuclei template listed
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
Complete at observationRead 22 Oct 2026 at 17:32 UTC
CISA KEV
Complete at observationRead 22 Oct 2026 at 17:32 UTC
FIRST EPSS
Complete at observationRead 22 Oct 2026 at 17:32 UTC
Public detection templates (Nuclei)
Complete at observationRead 22 Oct 2026 at 17:32 UTC

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

What changed

  1. Publisher revision note: Microsoft is announcing the availability of the security updates for Microsoft Office for Mac. Customers running affected Mac software should install the update for their product to be protected from this vulnerability. Customers running other Microsoft Office software do not need to take any actio… → Updated an acknowledgement. This is an informational change only. · Fixes: KB5002904: Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition); KB5002914: Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition) → KB5002904: Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition); KB5002910: Office Online Server; KB5002914: Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition) · Affected products: Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems, Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition), Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition), Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft Office 365 for Mac, Microsoft Office LTSC 2021 for 32-bit editions, Microsoft Office LTSC 2021 for 64-bit editions, Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office LTSC 2024 for 64-bit editions, Microsoft Office LTSC for Mac 2021, Microsoft Office LTSC for Mac 2024 → Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems, Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition), Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition), Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft Office 365 for Mac, Microsoft Office LTSC 2021 for 32-bit editions, Microsoft Office LTSC 2021 for 64-bit editions, Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office LTSC 2024 for 64-bit editions, Microsoft Office LTSC for Mac 2021, Microsoft Office LTSC for Mac 2024, Office Online Server
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 (15)

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

  1. 22 Oct 2026 · 17:33:15 UTC EPSS0.5%; scored 21 Oct 2026 → 0.5%; scored 22 Oct 2026
  2. 21 Oct 2026 · 21:47:24 UTC EPSS0.5%; scored 20 Oct 2026 → 0.5%; scored 21 Oct 2026
  3. 20 Oct 2026 · 20:53:31 UTC EPSS0.5%; scored 19 Oct 2026 → 0.5%; scored 20 Oct 2026
  4. 19 Oct 2026 · 15:12:40 UTC EPSS0.5%; scored 18 Oct 2026 → 0.5%; scored 19 Oct 2026
  5. 18 Oct 2026 · 14:54:30 UTC EPSS0.5%; scored 16 Oct 2026 → 0.5%; scored 18 Oct 2026
  6. 18 Oct 2026 · 14:54:30 UTC Link: September 2026/security?release=2026-Sep#cves
  7. 16 Oct 2026 · 16:13:25 UTC EPSS0.5%; scored 15 Oct 2026 → 0.5%; scored 16 Oct 2026
  8. 16 Oct 2026 · 15:49:54 UTC Revision noteMicrosoft is announcing the availability of the security updates for Microsoft Office for Mac. Customers running affected Mac software should install the update for their product to be protected from this vulnerability. Customers running other Microsoft Office software do not need to take any actio… → Updated an acknowledgement. This is an informational change only.
  9. 16 Oct 2026 · 15:49:54 UTC Last revised17 Sep 2026 07:00 UTC → 16 Oct 2026 07:00 UTC
  10. 16 Oct 2026 · 15:49:54 UTC Updates that fix itKB5002904: Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition); KB5002914: Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition) → KB5002904: Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition); KB5002910: Office Online Server; KB5002914: Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition)
  11. 16 Oct 2026 · 15:49:54 UTC Affected productsMicrosoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems, Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition), Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition), Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft Office 365 for Mac, Microsoft Office LTSC 2021 for 32-bit editions, Microsoft Office LTSC 2021 for 64-bit editions, Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office LTSC 2024 for 64-bit editions, Microsoft Office LTSC for Mac 2021, Microsoft Office LTSC for Mac 2024 → Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems, Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition), Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition), Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft Office 365 for Mac, Microsoft Office LTSC 2021 for 32-bit editions, Microsoft Office LTSC 2021 for 64-bit editions, Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office LTSC 2024 for 64-bit editions, Microsoft Office LTSC for Mac 2021, Microsoft Office LTSC for Mac 2024, Office Online Server
  12. 16 Oct 2026 · 15:49:54 UTC Link: KB5002910/windows/kb/KB5002910
  13. 15 Oct 2026 · 21:30:54 UTC EPSS0.5%; scored 14 Oct 2026 → 0.5%; scored 15 Oct 2026
  14. 15 Oct 2026 · 01:07:54 UTC EPSS0.5%; scored 13 Oct 2026 → 0.5%; scored 14 Oct 2026
  15. 14 Oct 2026 · 11:22:42 UTC Source coverage: msrc-cvrfIncomplete → Current
ChangeIntel

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Sources read 11 Nov 05:47 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current

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